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

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Summary

CVECVE-2025-66035
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-26 23:15:49 UTC
Updated2026-06-02 14:16:36 UTC
DescriptionAngular 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.

Risk And Classification

Primary CVSS: v4.0 7.7 HIGH from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-201 | CWE-359 | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data | CWE-359 CWE-359: Exposure of Private Personal Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary7.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/C...
4.0CNADECLARED7.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
High
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Angular Angular affected >= 21.0.0-next.0, < 21.0.1 Not specified
CNA Angular Angular affected >= 20.0.0-next.0, < 20.3.14 Not specified
CNA Angular Angular affected < 19.2.16 Not specified
ADP Siemens RUGGEDCOM RST2428P affected V4.0 custom Not specified
ADP Siemens SIDIS Prime affected V4.0.800 custom Not specified

References

ReferenceSourceLinkTags
github.com/angular/angular/releases/tag/21.0.1 [email protected] github.com
github.com/angular/angular/security/advisories/GHSA-58c5-g7wp-6w37 [email protected] github.com
github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f [email protected] github.com
github.com/angular/angular/commit/3240d856d942727372a705252f7c8c115394a41e [email protected] github.com
github.com/angular/angular/releases/tag/19.2.16 [email protected] github.com
github.com/angular/angular/releases/tag/20.3.14 [email protected] github.com
cert-portal.siemens.com/productcert/html/ssa-253495.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
cert-portal.siemens.com/productcert/html/ssa-485750.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
github.com/angular/angular/commit/05fe6686a97fa0bcd3cf157805b3612033f975bc [email protected] github.com
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