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CVE-2026-41423— Angular: SSRF via protocol-relative and backslash URLs in Angular Platform-Server

Quick assessment

Affected
angular angular
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 19.2.21之前版本、20.3.19之前版本、21.2.9之前版本和22.0.0-next.8之前版本存在代码问题漏洞，该漏洞源于@angular/platform-server中URL处理不当，可能导致服务器端请求伪造，使攻击者控制本地源并重定向请求。

AI Predicted 6.5 Difficulty: Easy EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
angular angular < 19.2.21 affected
>= 20.0.0-next.0, < 20.3.19 affected
>= 21.0.0-next.0, < 21.2.9 affected
>= 22.0.0-next.0, < 22.0.0-next.8 affected
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I. Basic Information for CVE-2026-41423

Vulnerability Information
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Vulnerability Title
Angular: SSRF via protocol-relative and backslash URLs in Angular Platform-Server
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 19.2.21, 20.3.19, 21.2.9, and 22.0.0-next.8, a Server-Side Request Forgery (SSRF) vulnerability exists in @angular/platform-server due to improper handling of URLs during Server-Side Rendering (SSR). When an attacker sends a request such as GET /\evil.com/ HTTP/1.1 the server engine (Express, etc.) passes the URL string to Angular’s rendering functions. Because the URL parser normalizes the backslash to a forward slash for HTTP/HTTPS schemes, the internal state of the application is hijacked to believe the current origin is evil.com. This misinterpretation tricks the application into treating the attacker’s domain as the local origin. Consequently, any relative HttpClient requests or PlatformLocation.hostname references are redirected to the attacker controlled server, potentially exposing internal APIs or metadata services. This issue has been patched in versions 19.2.21, 20.3.19, 21.2.9, and 22.0.0-next.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Angular 代码问题漏洞
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 19.2.21之前版本、20.3.19之前版本、21.2.9之前版本和22.0.0-next.8之前版本存在代码问题漏洞，该漏洞源于@angular/platform-server中URL处理不当，可能导致服务器端请求伪造，使攻击者控制本地源并重定向请求。
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 < 19.2.21 -

II. Public POCs for CVE-2026-41423

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III. Intelligence Information for CVE-2026-41423

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Patches & Fixes for CVE-2026-41423 (2)

Vendor Advisories for CVE-2026-41423 (1)

IV. Related Vulnerabilities

Same product: angular
Same vendor: angular
Same weakness: CWE-918

V. Comments for CVE-2026-41423

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