CVE-2026-50557 (GCVE-0-2026-50557)

Vulnerability from cvelistv5 – Published: 2026-06-22 15:11 – Updated: 2026-06-22 17:54
VLAI
Title
Angular: Template and Attribute Namespace Sanitization Bypass (XSS)
Summary
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22, an issue in the @angular/compiler and @angular/core packages allows bypassing element and attribute sanitization/validation through specific namespace workarounds. Specifically, namespaced script elements (e.g., <svg:script> or <:svg:script>) were not properly identified as script elements by the Angular template preparser, allowing them to pass through template compilation without being stripped. Furthermore, security context schema mappings for element attributes did not consistently handle attributes within namespaced elements (like SVG and MathML), opening up gaps where malicious namespaced attributes could bypass runtime and compile-time sanitizers. Combined, these flaws enable an attacker who can inject or supply a template/tag structure with custom namespaces to bypass Angular's script-stripping logic and attribute sanitizers, leading to client-side Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 17:51 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version CPE status
angular angular Affected: >= 21.0.0-next.0 < 21.2.15
Affected: >= 22.0.0-next.0 < 22.0.0-rc.2
Affected: >= 20.0.0-next.0 < 20.3.22
Affected: >= 19.0.0-next.0 < 19.2.22
Affected: <= 18.2.14
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                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "LOW"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-79",
                  "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-22T15:11:48.347Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/angular/angular/security/advisories/GHSA-f3m7-gqxr-g87x",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/angular/angular/security/advisories/GHSA-f3m7-gqxr-g87x"
            },
            {
              "name": "https://github.com/angular/angular/pull/68689",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/pull/68689"
            },
            {
              "name": "https://github.com/angular/angular/pull/68868",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/angular/angular/pull/68868"
            }
          ],
          "source": {
            "advisory": "GHSA-f3m7-gqxr-g87x",
            "discovery": "UNKNOWN"
          },
          "title": "Angular: Template and Attribute Namespace Sanitization Bypass (XSS)"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-50557",
        "datePublished": "2026-06-22T15:11:48.347Z",
        "dateReserved": "2026-06-04T21:34:34.426Z",
        "dateUpdated": "2026-06-22T17:54:55.320Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.