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[ CVE-2026-111754 · Published 3 Nov 2026 ]

@angular/platform-server: Open Redirect via Protocol-Relative URLs in Server-Side Rendering (SSR)

CVSS 5.1 EPSS <1%1 agency advisoryFix available

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

  • @angular/platform-server 22.2.1Fixed version · GitHub Advisories · npm package @angular/platform-server: upgrade to 22.2.1 or later (affected >= 22.0.0, < 22.2.1)
  • @angular/platform-server 21.2.25Fixed version · GitHub Advisories · npm package @angular/platform-server: upgrade to 21.2.25 or later (affected >= 21.0.0, < 21.2.25)
  • @angular/platform-server 20.3.33Fixed version · GitHub Advisories · npm package @angular/platform-server: upgrade to 20.3.33 or later (affected >= 20.0.0, < 20.3.33)

[ Advisories ]Government CERT advisories

[ Packages ]Affected open-source packages

[ References ]References