---
id: CVE-2026-55590
title: 'CakePHP Authentication: Open redirect weakness via backslash bypass'
summary: 'CakePHP Authentication: Open redirect weakness via backslash bypass'
severity: medium
cwe:
  - CWE-601
vendor: cakephp
product: cakephp/authentication
ecosystem: composer
affected:
  - cakephp/authentication < 3.3.6
  - 'cakephp/authentication >= 4.0.0, < 4.1.1'
patched:
  - cakephp/authentication 3.3.6
  - cakephp/authentication 4.1.1
published: '2026-06-17'
updated: '2026-06-20'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-hhpq-7wg4-36jm'
references:
  - url: >-
      https://github.com/cakephp/authentication/security/advisories/GHSA-hhpq-7wg4-36jm
  - url: 'https://github.com/advisories/GHSA-hhpq-7wg4-36jm'
tags:
  - ghsa
  - composer
ingestedAt: '2026-06-29T14:31:47.169Z'
epss: 0.00491
epssPercentile: 0.39602
---

## Overview

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

### Patches
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

- `cakephp/authentication < 3.3.6`
- `cakephp/authentication >= 4.0.0, < 4.1.1`

## Remediation

Upgrade to a patched release:

- `cakephp/authentication 3.3.6`
- `cakephp/authentication 4.1.1`