CVE-2026-111754

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CVE-2026-111754

Summary: Angular: Open Redirect via Protocol-Relative URLs in Server-Side Rendering (SSR)

Details: Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.33, 21.2.25, and 22.2.1, ServerPlatformLocation in Angular server-side rendering checks for protocol-relative URLs before WHATWG URL normalization. A request path containing a popping dot segment followed by multiple slashes can bypass the raw resolveUrl check and normalize to a pathname beginning with two slashes. When Angular SSR detects a mismatch with the router's final location, it can place that pathname in an HTTP Location header, causing a browser to navigate to an attacker-controlled origin. Affected applications use @angular/platform-server and @angular/ssr and either expose compatible parameter or child route shapes or pass user-controlled navigation targets through infrastructure that preserves the relevant dot segments or semicolons. Pure client-side SPAs are not affected. This issue is fixed in versions 20.3.33, 21.2.25, and 22.2.1.

References: https://github.com/angular/angular/releases/tag/v20.3.33, https://github.com/angular/angular/releases/tag/v21.2.25, https://github.com/angular/angular/releases/tag/v22.2.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111754.json, https://github.com/angular/angular/security/advisories/GHSA-w739-gvwx-grc3, https://nvd.nist.gov/vuln/detail/CVE-2026-111754, https://github.com/angular/angular/issues/71076, https://github.com/angular/angular/commit/450af9c813c7660b9bd91e5635f705ee3ed7b32a, https://github.com/angular/angular/commit/83944fc8c50e86be90e8ec4184cd15002b5af262, https://github.com/angular/angular/commit/928dcfd2582152655b5559509d057bf6a5a19521, https://github.com/angular/angular/pull/71077, https://github.com/angular/angular/pull/71078, https://github.com/angular/angular/pull/71079