Vulnerability in Getgrav Grav
CVE-2026-72701
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (11.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg (vendor-advisory)
- www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72701?
- CVE-2026-72701 is a low-severity vulnerability in Getgrav Grav, classified under CWE-208. CVSS score: 3.7/10. Published 2026-08-25.
- How severe is CVE-2026-72701?
- Low severity. CVSS v3 base score is 3.7 out of 10.