{"id":"GHSA-w72q-x6w3-7rj3","revision":null,"records":[{"revision":"c14d1e57e284450cbf5e47de49fdbeb5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-10032","aliases":[],"title":"Arbitrary JavaScript Execution via openUrl in @a2ui/web_core","description":"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. 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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** — `renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions.ts:428-430`:\n\n```ts\nexport const OpenUrlImplementation = createFunctionImplementation(OpenUrlApi, args => {\n  if (args.url && typeof window !== 'undefined' && window.open) {\n    window.open(args.url, '_blank');\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** — `renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions_api.ts:453-458`:\n\n```ts\nexport const OpenUrlApi = {\n  name: 'openUrl' as const,\n  returnType: 'void' as const,\n  schema: z.object({\n    url: z.preprocess(v => (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` — `ButtonApi` accepts `action: ActionSchema` (entry point).  \n2. `renderers/web_core/src/v0_9/schema/common-types.ts:126-130` — `ActionSchema` permits `{ functionCall: FunctionCallSchema }`.  \n3. `renderers/web_core/src/v0_9/rendering/generic-binder.ts:243-255` — on click, bound action calls `resolveDeepSync` then `dispatchAction`.  \n4. `renderers/web_core/src/v0_9/rendering/data-context.ts:93-105` — `resolveDynamicValue` detects the `call` key and invokes the named function.  \n5. `renderers/web_core/src/v0_9/catalog/types.ts:177-186` — 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` — `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` — **sink**: `window.open(args.url, '_blank')` 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` — `onClick={props.action}`  \n- Lit: `renderers/lit/src/v0_9/catalogs/basic/components/Button.ts:112` — `@click=${() => props.action()}`  \n- Angular: `renderers/angular/src/v0_9/catalog/basic/button.component.ts:103-110` — `handleClick()` → `dataContext.resolveAction` → `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.","state":0,"publishedAt":"2026-10-02T22:55:49+00:00","modifiedAt":"2026-10-02T23:15:06.6845538+00:00","affected":[{"ecosystem":"npm","name":"@a2ui/web_core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.9.0"},{"kind":"fixed","version":"0.10.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq","https://nvd.nist.gov/vuln/detail/CVE-2026-10032","https://github.com/a2ui-project/a2ui/pull/1707","https://github.com/a2ui-project/a2ui/commit/71573078c4168b2dc166bb847c3a85715dadc675","https://github.com/a2ui-project/a2ui"],"sourceUrl":"https://github.com/advisories/GHSA-72qq-p3r5-f7wq","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-72qq-p3r5-f7wq","identifiers":["GHSA-72qq-p3r5-f7wq","CVE-2026-10032"]},"retained":false,"historicalAffected":[]},{"revision":"c5d4f5fa83d54078a7181b7531f85f2a","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-w72q-x6w3-7rj3","aliases":[],"title":"Duplicate Advisory: @a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions","description":"## 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'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.","state":2,"publishedAt":"2026-08-04T18:31:26+00:00","modifiedAt":"2026-10-02T23:00:16.7855541+00:00","affected":[{"ecosystem":"npm","name":"@a2ui/web_core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.9.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq","https://nvd.nist.gov/vuln/detail/CVE-2026-10032"],"sourceUrl":"https://github.com/advisories/GHSA-w72q-x6w3-7rj3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w72q-x6w3-7rj3","identifiers":["GHSA-w72q-x6w3-7rj3"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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