CVE-2026-77337
Auth bypass via forgeable unencrypted legacy cookie tokens in CakePHP Authentication.
Is CVE-2026-77337 being exploited?
Not confirmed. CVE-2026-77337 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-77337?
CVE-2026-77337 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-77337?
Yes. A fix has been recorded for CVE-2026-77337. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77337 affect?
CVE-2026-77337 affects CakePHP Authentication plugin <2.11.2, CakePHP 3.0.0-3.3.6, CakePHP 4.0.0-4.2.0, PSR-7 apps using CookieAuthenticator with legacy tokens. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77337?
Upgrade to 2.11.2, 3.3.7, or 4.2.1; revoke/expire legacy cookies; disable unencrypted CookieAuthenticator.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers can bypass authentication to impersonate users and trigger CPU/memory exhaustion (DoS) by sending crafted legacy cookie tokens.
Immediate action required
- affected< 2.11.2
- affected>= 3.0.0 and < 3.3.7
- affected>= 4.0.0 and < 4.2.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.