Vulnerability · Published May 13, 2026 · Assigned by GitHub_M
CVE-2026-44437Angular SSR: Open Redirect and Request Steering via Encoded X-Forwarded-Prefix
Medium 6.9
In plain English
A medium-severity path traversal in angular-cli from angular. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @angular/ssr | 22.0.0-next.7 | GHSA-69xr-m8h6-h664 |
| npm | @angular/ssr | 21.2.9 | GHSA-69xr-m8h6-h664 |
| npm | @angular/ssr | 20.3.25 | GHSA-69xr-m8h6-h664 |
| npm | @angular/ssr | 19.2.25 | GHSA-69xr-m8h6-h664 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| angular | angular-cli | >= 22.0.0-next.0, < 22.0.0-next.7>= 21.0.0-next.0, < 21.2.9>= 20.0.0-next.0, < 20.3.25>= 19.0.0-next.0, < 19.2.25 |
Weakness: CWE-22, CWE-601 · Vector: 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
References
- https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664 x_refsource_CONFIRM
- https://github.com/angular/angular-cli/pull/33031 x_refsource_MISC