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CVE-2026-44437— Angular SSR: Open Redirect and Request Steering via Encoded X-Forwarded-Prefix

Quick assessment

Affected
angular angular-cli
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 SSR 19.0.0-next.0至19.2.25之前版本、20.3.25之前版本、21.2.9之前版本和22.0.0-next.7之前版本存在路径遍历漏洞，该漏洞源于X-Forwarded-Prefix标头处理逻辑中内部验证机制未能正确处理URL编码字符，可能导致攻击者绕过安全过滤器注入编码路径遍历序列。

AI Predicted 8.1 Difficulty: Easy EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
angular angular-cli >= 22.0.0-next.0, < 22.0.0-next.7 affected
>= 21.0.0-next.0, < 21.2.9 affected
>= 20.0.0-next.0, < 20.3.25 affected
>= 19.0.0-next.0, < 19.2.25 affected
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I. Basic Information for CVE-2026-44437

Vulnerability Information
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Vulnerability Title
Angular SSR: Open Redirect and Request Steering via Encoded X-Forwarded-Prefix
Source: CVE Program / CVE List V5
Vulnerability Description
The Angular SSR is a server-rise rendering tool for Angular applications. From 19.0.0-next.0 to before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7, a vulnerability exists in the X-Forwarded-Prefix header processing logic within Angular SSR. The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (%2e%2e). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic. When an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the X-Forwarded-Prefix header without prior sanitization, an attacker can provide a payload such as /%2e%2e/evil. This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Angular 路径遍历漏洞
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 SSR 19.0.0-next.0至19.2.25之前版本、20.3.25之前版本、21.2.9之前版本和22.0.0-next.7之前版本存在路径遍历漏洞，该漏洞源于X-Forwarded-Prefix标头处理逻辑中内部验证机制未能正确处理URL编码字符，可能导致攻击者绕过安全过滤器注入编码路径遍历序列。
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-cli >= 22.0.0-next.0, < 22.0.0-next.7 -

II. Public POCs for CVE-2026-44437

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III. Intelligence Information for CVE-2026-44437

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Patches & Fixes for CVE-2026-44437 (1)

Vendor Advisories for CVE-2026-44437 (1)

IV. Related Vulnerabilities

Same product: angular-cli
Same vendor: angular
Same weakness: CWE-22

V. Comments for CVE-2026-44437

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