CVE-2025-66035: Angular is Vulnerable to XSRF Token Leakage via Protocol-Relative URLs in Angular HTTP Client
(updated )
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.
References
- cert-portal.siemens.com/productcert/html/ssa-253495.html
- cert-portal.siemens.com/productcert/html/ssa-485750.html
- github.com/advisories/GHSA-58c5-g7wp-6w37
- github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f
- github.com/angular/angular/commit/05fe6686a97fa0bcd3cf157805b3612033f975bc
- github.com/angular/angular/commit/3240d856d942727372a705252f7c8c115394a41e
- github.com/angular/angular/releases/tag/19.2.16
- github.com/angular/angular/releases/tag/20.3.14
- github.com/angular/angular/releases/tag/21.0.1
- github.com/angular/angular/security/advisories/GHSA-58c5-g7wp-6w37
- nvd.nist.gov/vuln/detail/CVE-2025-66035
Code Behaviors & Features
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