Vulnerability · Published Jul 29, 2026 · Assigned by VulnCheck

CVE-2026-66400Grav Login Plugin before 3.8.13 Insufficient Session Expiration

Medium 4.8

In plain English

A medium-severity security flaw in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.2%top 84.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 3.8.13

Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-mj78-8gwc-vxjj) vendor-advisory
VulnCheck Advisory: Grav Login Plugin before 3.8.13 Insufficient Session Expiration third-party-advisory