Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M
CVE-2026-88060Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fallback Raw-Content Elements
High 8.6
In plain English
A high-severity cross-site scripting in angular from angular. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes untrusted input inside template content nested in fallback raw-content elements such as noscript, iframe, noembed, and noframes. The Domino serializer's fallbackRawContentTags traversal stopped at the DocumentFragment used by template.content, so matching closing tags in xmp, style, script, comments, or text nodes were not escaped. Standard interpolation with comments or text nodes is reachable without relaxed schemas; literal xmp or style requires CUSTOM_ELEMENTS_SCHEMA or NO_ERRORS_SCHEMA, while Renderer2 imperative DOM construction is unconditionally affected. When HTML5 RAWTEXT browser parsing encounters the unescaped closing tag, it exits the fallback container and interprets trailing markup as active DOM elements, enabling arbitrary JavaScript execution. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | angular.js | no fix listed | DEBIAN-CVE-2026-88060 |
| Debian:13 | angular.js | no fix listed | DEBIAN-CVE-2026-88060 |
| Ubuntu:22.04:LTS | angular.js | no fix listed | UBUNTU-CVE-2026-88060 |
| Ubuntu:24.04:LTS | angular.js | no fix listed | UBUNTU-CVE-2026-88060 |
| Ubuntu:26.04:LTS | angular.js | no fix listed | UBUNTU-CVE-2026-88060 |
| Ubuntu:26.10 | angular.js | no fix listed | UBUNTU-CVE-2026-88060 |
| npm | @angular/platform-server | no fix listed | GHSA-v3p8-whq6-r5jg |
| npm | @angular/platform-server | 20.3.30 | GHSA-v3p8-whq6-r5jg |
| npm | @angular/platform-server | 22.1.4 | GHSA-v3p8-whq6-r5jg |
| npm | @angular/platform-server | 21.2.22 | GHSA-v3p8-whq6-r5jg |
Affected products (as reported)
Weakness: CWE-79, CWE-116 · Vector: 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
References
- https://github.com/angular/angular/security/advisories/GHSA-v3p8-whq6-r5jg x_refsource_CONFIRM
- https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915 x_refsource_MISC
- https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef x_refsource_MISC
- https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8 x_refsource_MISC
- https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v20.3.30 x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v21.2.22 x_refsource_MISC
- https://github.com/angular/angular/releases/tag/v22.1.4 x_refsource_MISC