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

Quick assessment

Affected
angular angular
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Angular是Angular开源的一个开发平台。用于使用 Typescript / JavaScript 和其他语言构建移动和桌面 Web 应用程序。 Angular 19.2.16之前版本、20.3.14之前版本和21.0.1之前版本存在安全漏洞，该漏洞源于通过协议相对URL泄漏XSRF令牌，可能导致跨站请求伪造令牌泄露。

AI Predicted 5.3 Difficulty: Easy EPSS 0.72% · P54

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
angular angular >= 21.0.0-next.0, < 21.0.1 affected
>= 20.0.0-next.0, < 20.3.14 affected
< 19.2.16 affected
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I. Basic Information for CVE-2025-66035

Vulnerability Information
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Vulnerability Title
Angular HTTP Client Has XSRF Token Leakage via Protocol-Relative URLs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Angular 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Angular是Angular开源的一个开发平台。用于使用 Typescript / JavaScript 和其他语言构建移动和桌面 Web 应用程序。 Angular 19.2.16之前版本、20.3.14之前版本和21.0.1之前版本存在安全漏洞，该漏洞源于通过协议相对URL泄漏XSRF令牌，可能导致跨站请求伪造令牌泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
angular angular >= 21.0.0-next.0, < 21.0.1 -

II. Public POCs for CVE-2025-66035

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 10305 chars
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III. Intelligence Information for CVE-2025-66035

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Vendor Advisories for CVE-2025-66035 (1)

IV. Related Vulnerabilities

Same product: angular
Same vendor: angular
Same weakness: CWE-201