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EUVD-2026-318494

fkie_cve-2026-44437

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.

GHSA-69xr-m8h6-h664 — Angular SSR has Open Redirect and Request Steering via Encoded X-Forwarded-Prefix

Affected: npm: @angular/ssr

### Description 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`.

The vulnerability manifests in two ways: - Open Redirect: The application processes a redirect (e.g., router `redirectTo`). The decoded traversal payload manipulates the Location header, forcing the browser to an unintended path or external domain. - Server-Side Request Steering: The manipulated prefix is used as the base path for server-side `HttpClient` requests. This causes the server to make requests to unintended internal paths or external endpoints.

### Attack Preconditions - The application must use Angular SSR. - The application must perform internal redirects or use relative URLs in server-side `HttpClient` requests. - The upstream infrastructure (Reverse Proxy/CDN) must pass the `X-Forwarded-Prefix` header to the SSR process without stripping or sanitizing it.

### Workarounds Until the patch is applied, developers should manually sanitize the `X-Forwarde…

WID-SEC-W-2026-1541 — Angular: Schwachstelle ermöglicht Manipulation von Daten

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Angular ausnutzen, um Daten zu manipulieren.