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

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-13 · updated 2026-10-26
Weakness: CWE-22

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 products

angular-cli: from 19.0.0 before 19.2.25; from 20.0.0 before 20.3.25; from 21.0.0 before 21.2.9; 22.0.0-next0, 22.0.0-next1, 22.0.0-next2, 22.0.0-next3, 22.0.0-next4, 22.0.0-next5 (+1) — fixed in 19.2.25, 20.3.25, 21.2.9

How to fix

Upgrade to a fixed version: angular-cli 19.2.25, 20.3.25, 21.2.9. Check the vendor advisory for mitigations.

References

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