CVE-2026-72701
Published:August 25, 2026
Updated:September 24, 2026
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 Packages
https://github.com/getgrav/grav.git (GITHUB):
Affected version(s) >=0.1.0 <2.0.16Fix Suggestion:
Update to version 2.0.16getgrav/grav (PHP):
Affected version(s) >=0.8.0 <2.0.16Fix Suggestion:
Update to version 2.0.16getgrav/grav (PHP):
Affected version(s) >=dev-add-claude-github-actions-1770170196497 <2.0.16Fix Suggestion:
Update to version 2.0.16Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Observable Timing Discrepancy
EPSS
Base Score:
0.18