CVE-2026-55590: CakePHP Authentication is an authentication plugin for CakePHP that can also be used in PSR-7 based applicatio

Routine

MEDIUM 6.1UPGRADE

CVE-2026-55590 is a medium-severity flaw (CVSS 6.1) affecting cakephp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-07-09
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: cakephp

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-09 19:17 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

cakephp cakephp UPGRADE

Affected: < 2.11.1 · >= 3.0.0 and < 3.3.6 · >= 4.0.0 and < 4.1.1

Fixed in: 2.11.1, 3.3.6, 4.1.1

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy cakephp || rpm -q cakephp || cakephp --version

2. UPGRADE to 2.11.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cakephp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cakephp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison cakephp sudo apt install cakephp=<VERSION_BEFORE_3.0.0> sudo apt-mark hold cakephp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cakephp sudo dnf downgrade cakephp-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add cakephp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55590?

cakephp: upgrade to 2.11.1, 3.3.6, 4.1.1. Exact commands for each OS are on this page.

Is CVE-2026-55590 being exploited?

CVE-2026-55590 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55590 affect?

CVE-2026-55590 affects cakephp. Severity is medium (CVSS 6.1). 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 redirec

How urgent is CVE-2026-55590?

Priority 32/100. No elevated risk signals yet.

References

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