Vulnerability-Lookup

CVE-2026-88058 (GCVE-0-2026-88058)

Vulnerability from cvelistv5 – Published: 2026-09-10 18:56 – Updated: 2026-09-11 15:14

Title

Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements

Summary

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes ProcessingInstruction DOM nodes inside fallback raw-content elements without escaping matching ancestor closing tags. ProcessingInstruction data escaped greater-than characters but left less-than characters untouched and did not inspect fallback ancestors, so data such as a matching closing tag prematurely terminates noscript, iframe, noembed, or noframes containers. The vulnerable nodes cannot be authored through standard Angular templates; reachability requires application or library code using inject(DOCUMENT).createProcessingInstruction with attacker-controlled data or Renderer2 DOM insertion inside a fallback container. In HTML5 RAWTEXT parsing, the premature close causes subsequent sibling elements to be interpreted as live HTML and enables arbitrary JavaScript execution in a victim's browser. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-11 15:14 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116 - Improper Encoding or Escaping of Output

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7761 records in the last 180 days details

References

9 references

URL	Tags
https://github.com/angular/angular/security/advis…	x_refsource_CONFIRM
https://github.com/angular/angular/issues/70146	x_refsource_MISC
https://github.com/angular/angular/commit/73d8bbd…	x_refsource_MISC
https://github.com/angular/angular/commit/89b2056…	x_refsource_MISC
https://github.com/angular/angular/commit/ba3bc47…	x_refsource_MISC
https://github.com/angular/domino/commit/04f987dc…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v22.1.4	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
angular	angular	Affected: <= 19.2.25 Affected: >= 20.0.0, < 20.3.30 Affected: >= 21.0.0, < 21.2.22 Affected: >= 22.0.0, < 22.1.4	guessed

Show details on NVD website

JSON

To clipboard

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                "subIntegrityImpact": "NONE",
                "userInteraction": "PASSIVE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-79",
                  "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-116",
                  "description": "CWE-116: Improper Encoding or Escaping of Output",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-10T18:56:03.369Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4"
            },
            {
              "name": "https://github.com/angular/angular/issues/70146",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/issues/70146"
            },
            {
              "name": "https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915"
            },
            {
              "name": "https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef"
            },
            {
              "name": "https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8"
            },
            {
              "name": "https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f"
            },
            {
              "name": "https://github.com/angular/angular/releases/tag/v20.3.30",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/releases/tag/v20.3.30"
            },
            {
              "name": "https://github.com/angular/angular/releases/tag/v21.2.22",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/releases/tag/v21.2.22"
            },
            {
              "name": "https://github.com/angular/angular/releases/tag/v22.1.4",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/releases/tag/v22.1.4"
            }
          ],
          "source": {
            "advisory": "GHSA-j3r3-mxqp-r2p4",
            "discovery": "UNKNOWN"
          },
          "title": "Angular: SSR XSS via Unescaped Processing Instruction (\u003c?...?\u003e) Nodes in Fallback Raw-Content Elements"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-88058",
        "datePublished": "2026-09-10T18:56:03.369Z",
        "dateReserved": "2026-09-09T21:22:45.434Z",
        "dateUpdated": "2026-09-10T18:56:03.369Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-88058

Vulnerability from fkie_nvd - Published: 2026-09-10 19:17 - Updated: 2026-09-29 19:01

Severity

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915	Patch
security-advisories@github.com	https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef	Patch
security-advisories@github.com	https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8	Patch
security-advisories@github.com	https://github.com/angular/angular/issues/70146	Issue Tracking, Patch
security-advisories@github.com	https://github.com/angular/angular/releases/tag/v20.3.30	Release Notes
security-advisories@github.com	https://github.com/angular/angular/releases/tag/v21.2.22	Release Notes
security-advisories@github.com	https://github.com/angular/angular/releases/tag/v22.1.4	Release Notes
security-advisories@github.com	https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4	Exploit, Third Party Advisory
security-advisories@github.com	https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f	Patch
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/angular/angular/issues/70146	Issue Tracking, Patch
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4	Exploit, Third Party Advisory

Impacted products

Vendor	Product	Version
angular	angular	*
angular	angular	*
angular	angular	*
angular	angular	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "angular",
          "vendor": "angular",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 19.2.25"
            },
            {
              "status": "affected",
              "version": "\u003e= 20.0.0, \u003c 20.3.30"
            },
            {
              "status": "affected",
              "version": "\u003e= 21.0.0, \u003c 21.2.22"
            },
            {
              "status": "affected",
              "version": "\u003e= 22.0.0, \u003c 22.1.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "E33A4BDD-13F2-4937-9328-488EB06169A7",
              "versionEndIncluding": "19.2.25",
              "versionStartIncluding": "19.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "8AB46288-7919-451D-AE5F-97A7371F130A",
              "versionEndExcluding": "20.3.30",
              "versionStartIncluding": "20.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "2EC4EC89-DAE6-4B7A-B27B-ED329454145F",
              "versionEndExcluding": "21.2.22",
              "versionStartIncluding": "21.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "7A3D8CF6-1272-4004-8C88-373910CDEE48",
              "versionEndExcluding": "22.1.4",
              "versionStartIncluding": "22.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes ProcessingInstruction DOM nodes inside fallback raw-content elements without escaping matching ancestor closing tags. ProcessingInstruction data escaped greater-than characters but left less-than characters untouched and did not inspect fallback ancestors, so data such as a matching closing tag prematurely terminates noscript, iframe, noembed, or noframes containers. The vulnerable nodes cannot be authored through standard Angular templates; reachability requires application or library code using inject(DOCUMENT).createProcessingInstruction with attacker-controlled data or Renderer2 DOM insertion inside a fallback container. In HTML5 RAWTEXT parsing, the premature close causes subsequent sibling elements to be interpreted as live HTML and enables arbitrary JavaScript execution in a victim\u0027s browser. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4."
    }
  ],
  "id": "CVE-2026-88058",
  "lastModified": "2026-09-29T19:01:24.747",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-88058",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-11T15:14:28.505071Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-10T19:17:41.800",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/angular/angular/issues/70146"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/angular/angular/releases/tag/v20.3.30"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/angular/angular/releases/tag/v21.2.22"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/angular/angular/releases/tag/v22.1.4"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/angular/angular/issues/70146"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-J3R3-MXQP-R2P4

Vulnerability from github – Published: 2026-09-28 20:39 – Updated: 2026-09-28 20:39

Summary

Angular SSR: XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements

Details

Summary

An XSS vulnerability exists in @angular/platform-server during server-side rendering (SSR) HTML serialization of ProcessingInstruction DOM nodes (<?target data?>, nodeType === 7) when nested inside fallback raw-content elements (<noscript>, <iframe>, <noembed>, <noframes>). While processing instruction data escaped > to >, it did not check for or escape matching closing tags of ancestor fallback elements (e.g., </noscript>). When rendered in a browser with scripting enabled, an unescaped closing tag sequence in a processing instruction prematurely closes the fallback raw-content tag and causes subsequent sibling elements to execute as live HTML.

Technical Description

In HTML5 parsing, fallback raw-content elements (<noscript>, <iframe>, <noembed>, <noframes>) place the browser's HTML tokenizer into RAWTEXT mode. In RAWTEXT mode, processing instruction tokens (<?...?>) are treated as literal raw text rather than bogus comments, and the parser ignores > or ?>. The only token sequence that terminates the container is an end tag matching the container tag name (</noscript, </iframe, etc.).

During server-side HTML serialization, processing instruction nodes previously only replaced > with > (preventing bogus comment breakouts in normal HTML data states) but left < untouched. Crucially, processing instruction serialization never inspected ancestor fallback raw-content tags. As a result, if a ProcessingInstruction node inside <noscript> contained </noscript in its data payload, it was emitted unescaped as <?x </noscript ?>.

Impact & Reachability

Reachability: Processing instruction nodes cannot be authored directly through standard Angular template syntax (which parses <?...> into comment nodes in DOM position). Reaching this vulnerability requires application or library code calling inject(DOCUMENT).createProcessingInstruction(target, data) or Renderer2 DOM insertion methods with untrusted user input passed to data inside a fallback raw-content container.
Impact: In applications that programmatically construct processing instruction nodes inside fallback elements during server-side rendering, an attacker controlling the processing instruction data can break out of the container and execute arbitrary JavaScript in victims' browsers.

Proof of Concept (Minimal Reproduction)

import { Component, ElementRef, Renderer2, inject, DOCUMENT, AfterViewInit } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,
  template: `<noscript id="host"></noscript>`
})
export class AppComponent implements AfterViewInit {
  private r = inject(Renderer2);
  private el = inject(ElementRef);
  private doc = inject(DOCUMENT);

  ngAfterViewInit() {
    const host = this.el.nativeElement.querySelector('#host');

    // Attacker-controlled input passed as Processing Instruction data
    const pi = this.doc.createProcessingInstruction('x', '</noscript ');
    this.r.appendChild(host, pi);

    // Sibling markup that should remain inert inside <noscript>
    const img = this.r.createElement('img');
    this.r.setAttribute(img, 'src', 'x');
    this.r.setAttribute(img, 'onerror', 'alert("SSR_PI_XSS")');
    this.r.appendChild(host, img);
  }
}

Vulnerable SSR Output:

<noscript><?x </noscript ?><img src="x" onerror="alert('SSR_PI_XSS')"></noscript>

Workarounds

Avoid passing untrusted user input into document.createProcessingInstruction(target, data) when the node is inserted into <noscript>, <iframe>, <noembed>, or <noframes> during server-side rendering.
Manually sanitize or replace < with < in any untrusted data passed to processing instruction nodes on the server.

Severity

8.6 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "22.0.0"
            },
            {
              "fixed": "22.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "21.0.0"
            },
            {
              "fixed": "21.2.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "20.0.0"
            },
            {
              "fixed": "20.3.30"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "19.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-88058"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-28T20:39:26Z",
    "nvd_published_at": "2026-09-10T19:17:41Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nAn XSS vulnerability exists in `@angular/platform-server` during server-side rendering (SSR) HTML serialization of `ProcessingInstruction` DOM nodes (`\u003c?target data?\u003e`, `nodeType === 7`) when nested inside fallback raw-content elements (`\u003cnoscript\u003e`, `\u003ciframe\u003e`, `\u003cnoembed\u003e`, `\u003cnoframes\u003e`). While processing instruction data escaped `\u003e` to `\u0026gt;`, it did not check for or escape matching closing tags of ancestor fallback elements (e.g., `\u003c/noscript\u003e`). When rendered in a browser with scripting enabled, an unescaped closing tag sequence in a processing instruction prematurely closes the fallback raw-content tag and causes subsequent sibling elements to execute as live HTML.\n\n### Technical Description\nIn HTML5 parsing, fallback raw-content elements (`\u003cnoscript\u003e`, `\u003ciframe\u003e`, `\u003cnoembed\u003e`, `\u003cnoframes\u003e`) place the browser\u0027s HTML tokenizer into `RAWTEXT` mode. In `RAWTEXT` mode, processing instruction tokens (`\u003c?...?\u003e`) are treated as literal raw text rather than bogus comments, and the parser ignores `\u003e` or `?\u003e`. The only token sequence that terminates the container is an end tag matching the container tag name (`\u003c/noscript`, `\u003c/iframe`, etc.).\n\nDuring server-side HTML serialization, processing instruction nodes previously only replaced `\u003e` with `\u0026gt;` (preventing bogus comment breakouts in normal HTML data states) but left `\u003c` untouched. Crucially, processing instruction serialization never inspected ancestor fallback raw-content tags. As a result, if a `ProcessingInstruction` node inside `\u003cnoscript\u003e` contained `\u003c/noscript ` in its data payload, it was emitted unescaped as `\u003c?x \u003c/noscript ?\u003e`.\n\n### Impact \u0026 Reachability\n* **Reachability**: Processing instruction nodes cannot be authored directly through standard Angular template syntax (which parses `\u003c?...\u003e` into comment nodes in DOM position). Reaching this vulnerability requires application or library code calling `inject(DOCUMENT).createProcessingInstruction(target, data)` or `Renderer2` DOM insertion methods with untrusted user input passed to `data` inside a fallback raw-content container.\n* **Impact**: In applications that programmatically construct processing instruction nodes inside fallback elements during server-side rendering, an attacker controlling the processing instruction data can break out of the container and execute arbitrary JavaScript in victims\u0027 browsers.\n\n### Proof of Concept (Minimal Reproduction)\n```ts\nimport { Component, ElementRef, Renderer2, inject, DOCUMENT, AfterViewInit } from \u0027@angular/core\u0027;\n\n@Component({\n  selector: \u0027app-root\u0027,\n  standalone: true,\n  template: `\u003cnoscript id=\"host\"\u003e\u003c/noscript\u003e`\n})\nexport class AppComponent implements AfterViewInit {\n  private r = inject(Renderer2);\n  private el = inject(ElementRef);\n  private doc = inject(DOCUMENT);\n\n  ngAfterViewInit() {\n    const host = this.el.nativeElement.querySelector(\u0027#host\u0027);\n    \n    // Attacker-controlled input passed as Processing Instruction data\n    const pi = this.doc.createProcessingInstruction(\u0027x\u0027, \u0027\u003c/noscript \u0027);\n    this.r.appendChild(host, pi);\n    \n    // Sibling markup that should remain inert inside \u003cnoscript\u003e\n    const img = this.r.createElement(\u0027img\u0027);\n    this.r.setAttribute(img, \u0027src\u0027, \u0027x\u0027);\n    this.r.setAttribute(img, \u0027onerror\u0027, \u0027alert(\"SSR_PI_XSS\")\u0027);\n    this.r.appendChild(host, img);\n  }\n}\n```\n**Vulnerable SSR Output**:\n```html\n\u003cnoscript\u003e\u003c?x \u003c/noscript ?\u003e\u003cimg src=\"x\" onerror=\"alert(\u0027SSR_PI_XSS\u0027)\"\u003e\u003c/noscript\u003e\n```\n\n### Workarounds\n* Avoid passing untrusted user input into `document.createProcessingInstruction(target, data)` when the node is inserted into `\u003cnoscript\u003e`, `\u003ciframe\u003e`, `\u003cnoembed\u003e`, or `\u003cnoframes\u003e` during server-side rendering.\n* Manually sanitize or replace `\u003c` with `\u0026lt;` in any untrusted data passed to processing instruction nodes on the server.",
  "id": "GHSA-j3r3-mxqp-r2p4",
  "modified": "2026-09-28T20:39:26Z",
  "published": "2026-09-28T20:39:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88058"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/issues/70146"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/angular/angular"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/releases/tag/v20.3.30"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/releases/tag/v21.2.22"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/releases/tag/v22.1.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Angular SSR: XSS via Unescaped Processing Instruction (\u003c?...?\u003e) Nodes in Fallback Raw-Content Elements"
}

UBUNTU-CVE-2026-88058 (CVE-2026-88058)

Vulnerability from osv_ubuntu – Published: 2026-09-10 19:17 – Updated: 2026-10-17 09:54 – Source website

Details

Severity

8.6 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

6.1 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-88058	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-88058	REPORT
	https://github.com/angular/angular/security/advis…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.2.28-1ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.2.28-1ubuntu2+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.28-1ubuntu2",
        "1.2.28-1ubuntu2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.5.10-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.5.10-1ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.10-1",
        "1.5.10-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.7.9-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.7.9-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.10-1",
        "1.7.9-1",
        "1.7.9-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.8.2-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.8.2-2ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.2-2",
        "1.8.2-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.8.3-1ubuntu0.24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.8.3-1ubuntu0.24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.3-1",
        "1.8.3-1ubuntu0.24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.8.3-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.8.3-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.3-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-angularjs",
            "binary_version": "1.8.3-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "angular.js",
        "purl": "pkg:deb/ubuntu/angular.js@1.8.3-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.3-3"
      ]
    }
  ],
  "aliases": [],
  "details": "Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes ProcessingInstruction DOM nodes inside fallback raw-content elements without escaping matching ancestor closing tags. ProcessingInstruction data escaped greater-than characters but left less-than characters untouched and did not inspect fallback ancestors, so data such as a matching closing tag prematurely terminates noscript, iframe, noembed, or noframes containers. The vulnerable nodes cannot be authored through standard Angular templates; reachability requires application or library code using inject(DOCUMENT).createProcessingInstruction with attacker-controlled data or Renderer2 DOM insertion inside a fallback container. In HTML5 RAWTEXT parsing, the premature close causes subsequent sibling elements to be interpreted as live HTML and enables arbitrary JavaScript execution in a victim\u0027s browser. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.",
  "id": "UBUNTU-CVE-2026-88058",
  "modified": "2026-10-17T09:54:16Z",
  "published": "2026-09-10T19:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88058"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88058"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-88058"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-88058 (GCVE-0-2026-88058)

FKIE_CVE-2026-88058

GHSA-J3R3-MXQP-R2P4

Summary

Technical Description

Impact & Reachability

Proof of Concept (Minimal Reproduction)

Workarounds

UBUNTU-CVE-2026-88058 (CVE-2026-88058)

Tags

Sightings

Nomenclature

Vulnerability timeline

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