{"id":"GHSA-gxx4-3xcv-f8qx","summary":"@angular/platform-server: Missing `\u003cnoscript\u003e` Raw-Text Serialization Escaping leads to Cross-Site Scripting (XSS) in Angular SSR","details":"A Cross-Site Scripting (XSS) vulnerability exists in `@angular/platform-server`'s DOM emulation dependency (`domino`) when serializing the content of `\u003cnoscript\u003e` elements.\n\nWhen rendering dynamic text content inside a `\u003cnoscript\u003e` element via template bindings (such as `{{ value }}` or `[textContent]`), the template engine expects the browser to render the content safely. Under Server-Side Rendering (SSR), `domino` is configured with scripting enabled, meaning `\u003cnoscript\u003e` is treated as a raw-text element.\n\nHowever, `domino`'s serializer completely omitted `\u003cnoscript\u003e` from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result, any occurrence of `\u003c/noscript\u003e` in the bound dynamic text was **never escaped under any circumstances**.\n\nThe unescaped closing tag was serialized directly into the output HTML (e.g. `\u003cnoscript\u003e\u003c/noscript\u003e\u003cscript\u003ealert(1)\u003c/script\u003e\u003c/noscript\u003e`). When parsed by a browser, it closes the `\u003cnoscript\u003e` block early, allowing the injected `\u003cscript\u003e` 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 a `\u003cnoscript\u003e` element. This can lead to session hijacking, credentials theft, unauthorized actions on behalf of users, and defacement.\n\n### Patched Versions\n\n- 22.0.0-rc.2\n- 21.2.16\n- 20.3.24\n- 19.2.25\n\n### Workarounds\n\nIf you cannot immediately update your dependencies, you can:\n\n- Avoid binding user-controlled values inside `\u003cnoscript\u003e` elements.\n- Sanitize any user input placed inside `\u003cnoscript\u003e` to explicitly strip closing `\u003c/noscript\u003e` tags before passing it to the template.","aliases":["CVE-2026-50556"],"modified":"2026-09-10T03:51:08.774813189Z","published":"2026-06-15T17:21:03Z","database_specific":{"cwe_ids":["CWE-79"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-06-15T17:21:03Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/angular/angular/security/advisories/GHSA-gxx4-3xcv-f8qx"},{"type":"WEB","url":"https://github.com/angular/angular/issues/68903"},{"type":"WEB","url":"https://github.com/angular/domino/pull/29"},{"type":"PACKAGE","url":"https://github.com/angular/angular"}],"affected":[{"package":{"name":"@angular/platform-server","ecosystem":"npm","purl":"pkg:npm/%40angular/platform-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"22.0.0-next.0"},{"fixed":"22.0.0-rc.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-gxx4-3xcv-f8qx/GHSA-gxx4-3xcv-f8qx.json"}},{"package":{"name":"@angular/platform-server","ecosystem":"npm","purl":"pkg:npm/%40angular/platform-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"21.0.0-next.0"},{"fixed":"21.2.16"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-gxx4-3xcv-f8qx/GHSA-gxx4-3xcv-f8qx.json"}},{"package":{"name":"@angular/platform-server","ecosystem":"npm","purl":"pkg:npm/%40angular/platform-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"20.0.0-next.0"},{"fixed":"20.3.24"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-gxx4-3xcv-f8qx/GHSA-gxx4-3xcv-f8qx.json"}},{"package":{"name":"@angular/platform-server","ecosystem":"npm","purl":"pkg:npm/%40angular/platform-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"19.0.0-next.0"},{"fixed":"19.2.25"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-gxx4-3xcv-f8qx/GHSA-gxx4-3xcv-f8qx.json"}},{"package":{"name":"@angular/platform-server","ecosystem":"npm","purl":"pkg:npm/%40angular/platform-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"18.2.14"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-gxx4-3xcv-f8qx/GHSA-gxx4-3xcv-f8qx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}