Vulnerability in Getgrav Grav
CVE-2026-66400
Grav Login Plugin versions before 3.8.13 contain an insufficient session expiration vulnerability in TokenStorage.php where the findTriplet() method fails to properly validate Remember Me token timestamps. Attackers with a captured Remember Me cookie can authenticate indefinitely instead of the configured timeout period, as the expiry check compares an array to a scalar value which always evaluates incorrectly in PHP.
EPSS: 0.002 (4.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Getgrav Grav — versions 0, 3.8.13
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-66400?
- CVE-2026-66400 is a medium-severity vulnerability in Getgrav Grav, classified under Insufficient Session Expiration. CVSS score: 4.8/10. Published 2026-07-29.
- How severe is CVE-2026-66400?
- Medium severity. CVSS v3 base score is 4.8 out of 10.