{"id":"CVE-2026-10032","aliases":["EUVD-2026-52744","GHSA-72qq-p3r5-f7wq","GHSA-w72q-x6w3-7rj3"],"status":"published","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. No non-default configuration is required; the Basic Catalog is enabled by default.","severity":{"version":"4.0","score":6.1,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00125,"percentile":0.02251,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-08-04T15:36:45Z","modified":"2026-11-06T10:46:29Z","fixes":[{"ecosystem":"npm","package":"@a2ui/web_core","fixed_in":["0.10.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@a2ui/web_core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.9.0"},{"fixed":"0.10.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@a2ui/web_core","ranges":[{"type":"SEMVER","events":[{"introduced":"0.9.0"},{"fixed":"0.10.2"}]}]}],"products":[{"vendor":"google","product":"@a2ui/web_core"},{"vendor":"google","product":"a2ui\\/web_core"}],"references":[{"url":"https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq","tags":["Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10032","tags":["advisory"]},{"url":"https://github.com/a2ui-project/a2ui/pull/1707","tags":["web"]},{"url":"https://github.com/a2ui-project/a2ui/commit/71573078c4168b2dc166bb847c3a85715dadc675","tags":["web"]},{"url":"https://github.com/advisories/GHSA-72qq-p3r5-f7wq"},{"url":"https://github.com/advisories/GHSA-w72q-x6w3-7rj3"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10032.json","tags":["advisory"]},{"url":"https://github.com/a2ui-project/a2ui","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-10032","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. No non-default configuration is required; the Basic Catalog is enabled by default.","status":"published","published":"2026-08-04T15:36:45.199Z","modified":"2026-08-04T17:43:20.898Z","cvss":[{"version":"4.0","score":6.1,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:40:12.486331Z"}],"euvd":[{"id":"EUVD-2026-52744","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. No non-default configuration is required; the Basic Catalog is enabled by default.","status":"published","published":"2026-08-04T15:36:45Z","modified":"2026-08-04T17:43:20Z","cvss":[{"version":"4.0","score":6.1,"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","level":"medium"}],"updated_at":"2026-11-02T18:02:22.516769Z"}],"ghsa":[{"id":"GHSA-72qq-p3r5-f7wq","title":"@a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions","description":"### 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'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.\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 =\u003e {\n  if (args.url \u0026\u0026 typeof window !== 'undefined' \u0026\u0026 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 =\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` — `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=${() =\u003e 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.","status":"published","published":"2026-10-02T22:55:49Z","modified":"2026-10-02T22:55:50Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:25.889593Z"},{"id":"GHSA-w72q-x6w3-7rj3","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 GHSA-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.","status":"withdrawn","published":"2026-08-04T18:31:26Z","modified":"2026-10-02T22:55:17Z","cvss":[{"version":"4.0","score":6.1,"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","level":"medium"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:25.889593Z"}],"nvd":[{"id":"CVE-2026-10032","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. No non-default configuration is required; the Basic Catalog is enabled by default.","status":"published","published":"2026-08-04T16:16:20.983Z","modified":"2026-10-23T23:10:00.157Z","cvss":[{"version":"4.0","score":6.1,"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","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:34.643497Z"}],"osv":[{"id":"CVE-2026-10032","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. No non-default configuration is required; the Basic Catalog is enabled by default.","status":"published","published":"2026-08-04T15:36:45.199Z","modified":"2026-11-06T10:46:29.818186936Z","cvss":[{"version":"4.0","score":6.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-06T11:08:55.873774Z"},{"id":"GHSA-72qq-p3r5-f7wq","title":"@a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions","description":"### 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'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.\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 =\u003e {\n  if (args.url \u0026\u0026 typeof window !== 'undefined' \u0026\u0026 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 =\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` — `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=${() =\u003e 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.","status":"published","published":"2026-10-02T22:55:49Z","modified":"2026-10-02T23:15:06.684553771Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:40.308826Z"},{"id":"GHSA-w72q-x6w3-7rj3","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 GHSA-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.","status":"withdrawn","published":"2026-08-04T18:31:26Z","modified":"2026-10-02T23:00:16.78555411Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"},{"version":"4.0","score":6.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:58.401149Z"}]}}