What’s Vulnerable › Vulnerabilities

CVE-2026-72700: Grav before 3.9.1 Timing Attack via Non-Constant-Time Token Comparison

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-10-12
• Weakness: CWE-208

Description

The getgrav/grav-plugin-login Composer plugin before 3.9.1 (used by Grav) compares password reset and account activation tokens using a non-constant-time === string comparison instead of hash_equals() in classes/Controller.php (taskReset()) and login.php (activation handler). Because the token-submission endpoint (taskReset) also lacks rate limiting, an attacker could in principle send repeated token guesses against a known username and use the timing differences to attempt to recover a valid token, though the vendor rates the practical exploitability as low and no end-to-end network exploit has been demonstrated.

Affected products

• getgrav grav: before 3.9.1 — fixed in 3.9.1

How to fix

Upgrade to a fixed version: getgrav grav 3.9.1. Check the vendor advisory for mitigations.

References

• https://github.com/getgrav/grav/security/advisories/GHSA-x239-6jqx-5hjh
• https://www.vulncheck.com/advisories/grav-before-timing-attack-via-non-constant-time-token-comparison
• https://github.com/getgrav/grav/security/advisories/GHSA-x239-6jqx-5hjh

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