What’s Vulnerable › Vulnerabilities

CVE-2026-72701: Grav CMS before 2.0.16 Timing Attack via verifyNonce

• Severity: low (CVSS 3.7 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: 2026-08-25 · updated 2026-10-12
• Weakness: CWE-208

Description

Grav CMS before 2.0.16 contains a timing vulnerability in Utils::verifyNonce() that uses non-constant-time string comparison with the === operator instead of hash_equals() for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through multiple requests, weakening CSRF protection below its intended security margin.

Affected products

• getgrav grav: before 2.0.16 — fixed in 2.0.16

How to fix

Upgrade to a fixed version: getgrav grav 2.0.16. Check the vendor advisory for mitigations.

References

• https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg
• https://www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce
• https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg

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