CVE-2026-72701CWE-208

CVE-2026-72701

Low · published August 25, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
11.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
6.3 · CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00216 · 11.4th percentile
Weakness
CWE-208 · Observable Timing Discrepancy
Published
2026-08-25T06:16Z
References (3)
https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg · [email protected]https://www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce · [email protected]https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 26 AUG 08:25Z
    EPSS moved — → 0%
    epss
  • 25 AUG 01:30Z
    Grav CMS before 2.0.16 Timing Attack via verifyNonce
    cvelistv5