What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-29 · updated 2026-10-23
• Weakness: CWE-613

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

• getgrav grav: before 3.8.13 — fixed in 3.8.13

How to fix

Upgrade to a fixed version: getgrav grav 3.8.13. Check the vendor advisory for mitigations.

References

• https://github.com/getgrav/grav/security/advisories/GHSA-mj78-8gwc-vxjj
• https://www.vulncheck.com/advisories/grav-login-plugin-before-insufficient-session-expiration
• https://github.com/getgrav/grav/security/advisories/GHSA-mj78-8gwc-vxjj

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