Vulnerability-Lookup

CVE-2026-10032 (GCVE-0-2026-10032)

Vulnerability from cvelistv5 – Published: 2026-08-04 15:36 – Updated: 2026-08-04 17:43

Title

Arbitrary JavaScript Execution via openUrl in @a2ui/web_core

Summary

The openUrl function in @a2ui/web_core passes an agent-controlled URL directly to window.open() without validating the URI scheme. A malicious agent can supply a javascript: URI as the url argument of a Button component's functionCall action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application's browser origin, constituting a stored/reflected XSS with Critical severity. No non-default configuration is required; the Basic Catalog is enabled by default.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 17:42 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Google CNA under the Google root

CNA scorecard B 77/100 over 39 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/a2ui-project/a2ui/security/adv…

Impacted products

1 product

Vendor	Product	Version	CPE status
Google	@a2ui/web_core	Affected: 0.9.0 Affected: 0.9.1-alpha.0 Affected: 0.9.1-alpha.1 Affected: 0.9.1-alpha.2 Affected: 0.9.1-alpha.3 Affected: 0.9.1-alpha.4 Affected: 0.9.1-alpha.5 Affected: 0.9.1 Affected: 0.9.2 Affected: 0.10.0 Affected: 0.10.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-10032

Vulnerability from fkie_nvd - Published: 2026-08-04 16:16 - Updated: 2026-10-23 23:10

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
	cve-coordination@google.com	https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq	Vendor Advisory

Impacted products

	Vendor	Product	Version
	google	a2ui\/web_core	*

JSON

To clipboard

{
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          "vendor": "Google",
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            },
            {
              "status": "affected",
              "version": "0.9.1-alpha.1"
            },
            {
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            },
            {
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            },
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            },
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              "versionStartIncluding": "0.9.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The openUrl function in @a2ui/web_core passes an agent-controlled URL directly to window.open() without validating the URI scheme. A malicious agent can supply a javascript: URI as the url argument of a Button component\u0027s functionCall action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application\u0027s browser origin, constituting a stored/reflected XSS with Critical severity. No non-default configuration is required; the Basic Catalog is enabled by default."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n openUrl en @a2ui/web_core pasa una URL controlada por un agente directamente a window.open() sin validar el esquema URI. Un agente malicioso puede proporcionar una URI javascript_disabled: como el argumento url de la acci\u00f3n functionCall de un componente Button. Cuando el usuario hace clic en el bot\u00f3n renderizado, se ejecuta JavaScript arbitrario en el origen del navegador de la aplicaci\u00f3n v\u00edctima, lo que constituye un XSS almacenado/reflejado con una severidad Cr\u00edtica. No se requiere ninguna configuraci\u00f3n no predeterminada; el Cat\u00e1logo B\u00e1sico est\u00e1 habilitado por defecto."
    }
  ],
  "id": "CVE-2026-10032",
  "lastModified": "2026-10-23T23:10:00.157",
  "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": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "UNREPORTED",
          "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": "LOW",
          "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:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/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": "LOW",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cve-coordination@google.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-10032",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-04T17:42:13.437105Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-04T16:16:20.983",
  "references": [
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq"
    }
  ],
  "sourceIdentifier": "cve-coordination@google.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "cve-coordination@google.com",
      "type": "Secondary"
    }
  ]
}

GHSA-72QQ-P3R5-F7WQ

Vulnerability from github – Published: 2026-10-02 22:55 – Updated: 2026-10-02 22:55

Summary

@a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions

Details

Summary

The openUrl function in @a2ui/web_core passes an agent-controlled URL directly to window.open() without validating the URI scheme. A malicious agent can supply a javascript: URI as the url argument of a Button component's functionCall action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application's browser origin, constituting a stored/reflected XSS. No non-default configuration is required; the Basic Catalog is enabled by default.

Details

The vulnerability exists in the openUrl function implementation within the Basic Catalog of @a2ui/web_core (commit 23a003248abbf59da6c376ea64ace91d82d209ff).

Sink — renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions.ts:428-430:

export const OpenUrlImplementation = createFunctionImplementation(OpenUrlApi, args => {
  if (args.url && typeof window !== 'undefined' && window.open) {
    window.open(args.url, '_blank');
  }
});

window.open is called unconditionally with the agent-supplied args.url value. No scheme allowlist or blocklist is applied.

Insufficient schema validation — renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions_api.ts:453-458:

export const OpenUrlApi = {
  name: 'openUrl' as const,
  returnType: 'void' as const,
  schema: z.object({
    url: z.preprocess(v => (v === undefined ? undefined : String(v)), z.string()),
  }),
};

The Zod schema only requires a string; javascript: URIs pass validation without any rejection.

Full source-to-sink data flow:

renderers/web_core/src/v0_9/basic_catalog/components/basic_components.ts:356 — ButtonApi accepts action: ActionSchema (entry point).
renderers/web_core/src/v0_9/schema/common-types.ts:126-130 — ActionSchema permits { functionCall: FunctionCallSchema }.
renderers/web_core/src/v0_9/rendering/generic-binder.ts:243-255 — on click, bound action calls resolveDeepSync then dispatchAction.
renderers/web_core/src/v0_9/rendering/data-context.ts:93-105 — resolveDynamicValue detects the call key and invokes the named function.
renderers/web_core/src/v0_9/catalog/types.ts:177-186 — catalog invoker runs fn.schema.parse(rawArgs) then fn.execute().
renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions_api.ts:453-458 — OpenUrlApi validates url as z.string() only (no scheme check).
renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions.ts:428-430 — sink: window.open(args.url, '_blank') executes the javascript: URI.

All three renderers implemented in the A2UI repository are affected:

React: renderers/react/src/v0_9/catalog/basic/components/Button.tsx:33 — onClick={props.action}
Lit: renderers/lit/src/v0_9/catalogs/basic/components/Button.ts:112 — @click=${() => props.action()}
Angular: renderers/angular/src/v0_9/catalog/basic/button.component.ts:103-110 — handleClick() → dataContext.resolveAction → dispatchAction

Any other A2UI renderer which depends on web_core and uses its basic catalog implementation is also affected.

Remediation

The issue was fixed in https://github.com/a2ui-project/a2ui/pull/1707 and released in web_core version 0.10.2, by blocking URLs that do not use the HTTP or HTTPS schemes, or those that are invalid.

Please fix this issue in your project by depending on a @a2ui/web_core version equal or greater than 0.10.2.

Severity

9.3 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@a2ui/web_core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.0"
            },
            {
              "fixed": "0.10.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-10032"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-02T22:55:49Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nThe `openUrl` function in `@a2ui/web_core` passes an agent-controlled URL directly to `window.open()` without validating the URI scheme. A malicious agent can supply a `javascript:` URI as the `url` argument of a `Button` component\u0027s `functionCall` action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application\u0027s browser origin, constituting a stored/reflected XSS. No non-default configuration is required; the Basic Catalog is enabled by default.\n\n### Details\n\nThe vulnerability exists in the `openUrl` function implementation within the Basic Catalog of `@a2ui/web_core` (commit `23a003248abbf59da6c376ea64ace91d82d209ff`).\n\n**Sink** \u2014 `renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions.ts:428-430`:\n\n```ts\nexport const OpenUrlImplementation = createFunctionImplementation(OpenUrlApi, args =\u003e {\n  if (args.url \u0026\u0026 typeof window !== \u0027undefined\u0027 \u0026\u0026 window.open) {\n    window.open(args.url, \u0027_blank\u0027);\n  }\n});\n```\n\n`window.open` is called unconditionally with the agent-supplied `args.url` value. No scheme allowlist or blocklist is applied.\n\n**Insufficient schema validation** \u2014 `renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions_api.ts:453-458`:\n\n```ts\nexport const OpenUrlApi = {\n  name: \u0027openUrl\u0027 as const,\n  returnType: \u0027void\u0027 as const,\n  schema: z.object({\n    url: z.preprocess(v =\u003e (v === undefined ? undefined : String(v)), z.string()),\n  }),\n};\n```\n\nThe Zod schema only requires a `string`; `javascript:` URIs pass validation without any rejection.\n\n**Full source-to-sink data flow:**\n\n1. `renderers/web_core/src/v0_9/basic_catalog/components/basic_components.ts:356` \u2014 `ButtonApi` accepts `action: ActionSchema` (entry point).  \n2. `renderers/web_core/src/v0_9/schema/common-types.ts:126-130` \u2014 `ActionSchema` permits `{ functionCall: FunctionCallSchema }`.  \n3. `renderers/web_core/src/v0_9/rendering/generic-binder.ts:243-255` \u2014 on click, bound action calls `resolveDeepSync` then `dispatchAction`.  \n4. `renderers/web_core/src/v0_9/rendering/data-context.ts:93-105` \u2014 `resolveDynamicValue` detects the `call` key and invokes the named function.  \n5. `renderers/web_core/src/v0_9/catalog/types.ts:177-186` \u2014 catalog invoker runs `fn.schema.parse(rawArgs)` then `fn.execute()`.  \n6. `renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions_api.ts:453-458` \u2014 `OpenUrlApi` validates `url` as `z.string()` only (no scheme check).  \n7. `renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions.ts:428-430` \u2014 **sink**: `window.open(args.url, \u0027_blank\u0027)` executes the `javascript:` URI.\n\n**All three renderers implemented in the A2UI repository are affected:**\n\n- React: `renderers/react/src/v0_9/catalog/basic/components/Button.tsx:33` \u2014 `onClick={props.action}`  \n- Lit: `renderers/lit/src/v0_9/catalogs/basic/components/Button.ts:112` \u2014 `@click=${() =\u003e props.action()}`  \n- Angular: `renderers/angular/src/v0_9/catalog/basic/button.component.ts:103-110` \u2014 `handleClick()` \u2192 `dataContext.resolveAction` \u2192 `dispatchAction`\n\nAny other A2UI renderer which depends on `web_core` and uses its basic catalog implementation is also affected.\n\n### Remediation\n\nThe issue was fixed in [https://github.com/a2ui-project/a2ui/pull/1707](https://github.com/a2ui-project/a2ui/pull/1707) and released in web\\_core version 0.10.2, by blocking URLs that do not use the HTTP or HTTPS schemes, or those that are invalid.\n\nPlease fix this issue in your project by depending on a @a2ui/web\\_core version equal or greater than 0.10.2.",
  "id": "GHSA-72qq-p3r5-f7wq",
  "modified": "2026-10-02T22:55:49Z",
  "published": "2026-10-02T22:55:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-10032"
    },
    {
      "type": "WEB",
      "url": "https://github.com/a2ui-project/a2ui/pull/1707"
    },
    {
      "type": "WEB",
      "url": "https://github.com/a2ui-project/a2ui/commit/71573078c4168b2dc166bb847c3a85715dadc675"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/a2ui-project/a2ui"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions"
}

GHSA-W72Q-X6W3-7RJ3

Vulnerability from github – Published: 2026-08-04 18:31 – Updated: 2026-10-02 22:55

Withdrawn 2026-10-02

Summary

Duplicate Advisory: @a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-72qq-p3r5-f7wq. This link is maintained to preserve external references.

Original Description

Severity

6.1 (Medium)


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

6.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 0.10.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@a2ui/web_core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-02T22:55:15Z",
    "nvd_published_at": "2026-08-04T16:16:20Z",
    "severity": "MODERATE"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-72qq-p3r5-f7wq. This link is maintained to preserve external references.\n\n## Original Description\nThe openUrl function in @a2ui/web_core passes an agent-controlled URL directly to window.open() without validating the URI scheme. A malicious agent can supply a javascript: URI as the url argument of a Button component\u0027s functionCall action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application\u0027s browser origin, constituting a stored/reflected XSS with Critical severity. No non-default configuration is required; the Basic Catalog is enabled by default.",
  "id": "GHSA-w72q-x6w3-7rj3",
  "modified": "2026-10-02T22:55:15Z",
  "published": "2026-08-04T18:31:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-10032"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Duplicate Advisory: @a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions",
  "withdrawn": "2026-10-02T22:55:15Z"
}

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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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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Action not permitted

CVE-2026-10032 (GCVE-0-2026-10032)

FKIE_CVE-2026-10032

GHSA-72QQ-P3R5-F7WQ

Summary

Details

Remediation

GHSA-W72Q-X6W3-7RJ3

Duplicate Advisory

Original Description

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