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EUVD-2026-335483

fkie_cve-2026-55590

CakePHP Authentication is an authentication plugin for CakePHP that can also be used in PSR-7 based applications. Prior to 2.11.1, 3.3.6, and 4.1.1, the getLoginRedirect() method contains a weakness to backslash bypasses that allows redirect targets with attacker-controlled hostnames through the redirect query string parameter. This issue is fixed in versions 2.11.1, 3.3.6, and 4.1.1.

GHSA-hhpq-7wg4-36jm — CakePHP Authentication: Open redirect weakness via backslash bypass

Affected: Packagist: cakephp/authentication

### Impact The `getLoginRedirect()` method contains a weakness to backslash bypasses allowing redirect targets with attacker controlled hostnames.

### Patches 2.11.1, 3.3.6 and 4.1.1 contain a fix for this issue.

### Workarounds If you are unable to upgrade, you should consider adding application validation to the redirect query string parameter to mitigate this vulnerability.