CVE-2025-66035

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to versions 19.2.16, 20.3.14, and 21.0.1, there is a XSRF token leakage via protocol-relative URLs in angular HTTP clients. The vulnerability is a Credential Leak by App Logic that leads to the unauthorized disclosure of the Cross-Site Request Forgery (XSRF) token to an attacker-controlled domain. Angular's HttpClient has a built-in XSRF protection mechanism that works by checking if a request URL starts with a protocol (http:// or https://) to determine if it is cross-origin. If the URL starts with protocol-relative URL (//), it is incorrectly treated as a same-origin request, and the XSRF token is automatically added to the X-XSRF-TOKEN header. This issue has been patched in versions 19.2.16, 20.3.14, and 21.0.1. A workaround for this issue involves avoiding using protocol-relative URLs (URLs starting with //) in HttpClient requests. All backend communication URLs should be hardcoded as relative paths (starting with a single /) or fully qualified, trusted absolute URLs.

• CWE-201
• CWE-359

• https://github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f
• https://github.com/angular/angular/commit/05fe6686a97fa0bcd3cf157805b3612033f975bc
• https://github.com/angular/angular/commit/3240d856d942727372a705252f7c8c115394a41e
• https://github.com/angular/angular/releases/tag/19.2.16
• https://github.com/angular/angular/releases/tag/20.3.14
• https://github.com/angular/angular/releases/tag/21.0.1
• https://github.com/angular/angular/security/advisories/GHSA-58c5-g7wp-6w37
• https://cert-portal.siemens.com/productcert/html/ssa-253495.html
• https://cert-portal.siemens.com/productcert/html/ssa-485750.html

Published

Nov 26, 2025

Last Modified

Jun 17, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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