CVE-2025-66035: Angular HTTP Client Has XSRF Token Leakage via Protocol-Relative URLs

High severity · published Nov 26, 2025

CVE-2025-66035

Angular HTTP Client Has XSRF Token Leakage via Protocol-Relative URLs

7.7

CVSS

0.7%

EPSS

On KEV

Description

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.

Exploitation

Is it being used?

Exploit prediction (EPSS)0.7% · higher than 54% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

angular · angular

>= 21.0.0-next.0, < 21.0.1; >= 20.0.0-next.0, < 20.3.14; < 19.2.16 · source: vendor

RUGGEDCOM RST2428P · Siemens

before V4.0 · source: CISA

SIDIS Prime · Siemens

before V4.0.800 · source: CISA

In the news

VulnerabilityCritical

Siemens SIDIS Prime

View CSAF Summary SIDIS Prime before V4.0.800 is affected by multiple vulnerabilities in the components OpenSSL, SQLite, and several Node.js packages as described below. Siemens has released a new version of SIDIS Prime and recommends to update to the latest version. The following versions of Siemens SIDIS Prime are affected: SIDIS Prime vers:intdot/<4.0.800 (CVE-2024-29857, CVE-2024-30171, CVE-2024-30172, CVE-2024-41996, CVE-2025-6965, CVE-2025-7783, CVE-2025-9230, CVE-2025-9232, CVE-2025-9670, CVE-2025-12816, CVE-2025-15284, CVE-2025-58751, CVE-2025-58752, CVE-2025-58754, CVE-2025-62522, CVE-2025-64718, CVE-2025-64756, CVE-2025-66030, CVE-2025-66031, CVE-2025-66035, CVE-2025-66412, CVE-2025-69277, CVE-2026-22610) CVSS Vendor Equipment Vulnerabilities v3 8.7 Siemens Siemens SIDIS Prime Out-of-bounds Read, Observable Discrepancy, Improper Input Validation, Improper Certificate Validation, Numeric Truncation Error, Use of Insufficiently Random Values, Out-of-bounds Write, Inefficient Regular Expression Complexity, Interpretation Conflict, Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Relative Path Traversal, Allocation of Resources Without Limits or Throttling, Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), Integer Overflow or Wraparound, Uncontrolled Recursio...

CVE-2024-29857 CVE-2024-30171 CVE-2024-30172

Mar 12, 2026·CISA Advisories

Affected product

angular

All angular CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-66035

CVE.org

https://www.cve.org/CVERecord?id=CVE-2025-66035

github.com

https://github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f