CVE-2026-77337

CakePHP: Potential Authentication bypass with CookieAuthenticator

9.1 Critical

CakePHP Authentication is an authentication plugin for CakePHP that can also be used in PSR-7 based applications. Versions before 2.11.2, from 3.0.0 through 3.3.6, and from 4.0.0 through 4.2.0 allow authentication bypass and potential CPU or memory exhaustion when CookieAuthenticator uses unencrypted, forgeable legacy tokens. This issue is fixed in versions 2.11.2, 3.3.7, and 4.2.1.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.70%Up 0.3 points since Aug 25, 2026

What each source reports

CVE List Score used 9.1

CakePHP: Potential Authentication bypass with CookieAuthenticator

Record: CVE-2026-77337
CVSS 4.0: 9.1 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-290, CWE-770
Updated: 2026-11-02

EUVDEUVD-2026-65157 9.1

Record: EUVD-2026-65157
CVSS 4.0: 9.1 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

NVD 9.1

Record: CVE-2026-77337
CVSS 4.0: 9.1 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-290, CWE-770
Updated: 2026-11-02

OSV 9.1

CakePHP: Potential Authentication bypass with CookieAuthenticator

Record: CVE-2026-77337
CVSS 4.0: 9.1 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-290, CWE-770
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-77337 9.1

Record: DEBIAN-CVE-2026-77337
CVSS 4.0: 9.1 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-77337 9.1

Record: UBUNTU-CVE-2026-77337
CVSS 4.0: 9.1 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-03

Affected products

cakephp authentication

Affected packages

Affected packages
Package	Affected	Fixed
`cakephp` Debian:11	All versions, plus listed versions 2.10.11-2.12.10.24-12.10.24-2	None known
`cakephp` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 2.7.2-12.8.0-12.8.0-1ubuntu0.1~esm1	None known
`cakephp` Ubuntu:20.04:LTS	All versions, plus listed versions 2.10.11-2	None known
`cakephp` Ubuntu:22.04:LTS	All versions, plus listed versions 2.10.11-2.12.10.24-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected, facts	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-77337 is a critical vulnerability (CVSS 9.1) in Cakephp Authentication, published August 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.70%, the 53rd percentile. No source names a fixed version.