{"id":"CVE-2026-69149","aliases":["GHSA-vpx6-8pjr-4g3v"],"url":"https://o3.security/vulnerability/CVE-2026-69149","summary":"Angular SSR: Missing Fallback Raw-Content Serialization Escaping leads to Cross-Site Scripting (XSS)","details":"A Cross-Site Scripting (XSS) vulnerability exists in `@angular/platform-server`'s DOM emulation dependency (`domino`) when serializing the content of fallback raw-content elements (`<iframe>`, `<noembed>`, `<noframes>`, and `<noscript>`).\n\nWhen rendering dynamic text content inside fallback raw-content elements via template bindings, the template engine expects the browser to render the content safely. Under Server-Side Rendering (SSR), `domino` is configured with scripting enabled, meaning these elements are treated as raw-text elements.\n\nHowever, `domino`'s serializer previously did not escape text nodes within fallback raw-content elements (`<iframe>`, `<noembed>`, `<noframes>`, `<noscript>`) during DOM serialization. As a result, any occurrence of closing tags in the bound dynamic text was not escaped.\n\nThe unescaped closing tag could be serialized directly into the output HTML. When parsed by a browser or re-parsed during SSR post-processing without preserving raw-content parser state, an injected closing tag closes the element early, allowing an injected script block to execute in the user's browser context, causing same-origin Cross-Site Scripting (XSS).\n\n### Impact\n\nThis vulnerability allows an attacker to perform same-origin Cross-Site Scripting (XSS) attacks against any user visiting an SSR-rendered page that binds user-controlled data inside fallback raw-content elements (`<iframe>`, `<noembed>`, `<noframes>`, `<noscript>`). This can lead to session hijacking, credentials theft, unauthorized actions on behalf of users, and defacement.\n\n### Patched Versions\n\n- 22.0.7\n- 21.2.19\n- 20.3.27\n\n### Workarounds\nIf you cannot immediately update your dependencies, you can mitigate this issue using any of the following approaches:\n- **Disable critical CSS inlining**: Critical CSS inlining in Angular SSR post-processes the rendered HTML using `domino`. Disabling this step prevents `domino` from re-parsing and re-serializing the HTML during server-side rendering.\n  - In `angular.json`, set `inlineCritical` to `false` under style optimization options:\n    ```json\n    {\n      \"projects\": {\n        \"my-app\": {\n          \"architect\": {\n            \"build\": {\n              \"builder\": \"@angular/build:application\",\n              \"options\": {\n                \"optimization\": {\n                  \"styles\": {\n                    \"inlineCritical\": false\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n    }\n    ```\n  - When rendering programmatically with `CommonEngine`, set `inlineCriticalCss: false` in your render options.\n- **Avoid binding user-controlled values** inside fallback raw-content elements (`<iframe>`, `<noembed>`, `<noframes>`, `<noscript>`).\n- **Sanitize user input** placed inside these elements to explicitly strip or escape closing tags before passing it to the template.","published":"2026-08-03T16:14:39.636Z","modified":"2026-10-28T02:30:48.991960551Z","cvss":null,"epss":{"score":0.00206,"percentile":0.10878,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"22.0.7"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"21.2.19"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"20.3.27"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":null}],"fix":{"url":"https://github.com/angular/angular/pull/69675","label":"angular/angular#69675"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69149.json"},{"type":"ADVISORY","url":"https://github.com/angular/angular/security/advisories/GHSA-vpx6-8pjr-4g3v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69149"},{"type":"FIX","url":"https://github.com/angular/angular/pull/69675"},{"type":"FIX","url":"https://github.com/angular/angular/pull/69714"},{"type":"FIX","url":"https://github.com/angular/angular/pull/69929"},{"type":"FIX","url":"https://github.com/angular/angular/pull/69930"},{"type":"FIX","url":"https://github.com/angular/domino/commit/f88e5aa49cf2804d7c2df22ef1640eb4ec43dd56"},{"type":"FIX","url":"https://github.com/angular/domino/pull/32"},{"type":"PACKAGE","url":"https://github.com/angular/angular"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:48.991960551Z"}}