MEDIUMCVSS 5.1EPSS 0.3%

CVE-2026-55590

CakePHP Authentication: Open redirect weakness via backslash bypass

Published: 2026-06-17
Modified: 2026-08-14
EPSS percentile: 20%
Aliases: GHSA-hhpq-7wg4-36jm
Sources: github-advisory

Summary

### 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.

Affected packages

Ecosystem	Package	Affected versions	Fixed versions
Packagist	cakephp/authentication	—	4.1.1, 3.3.6, 2.11.1

Remediation: Upgrade to 4.1.1 or later.

References

https://github.com/advisories/GHSA-hhpq-7wg4-36jm

Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.

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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.