Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection

Summary Grav\Common\Utils::verifyNonce, the core function Grav and its plugins use to validate CSRF nonces, compares the submitted nonce to the expected value with PHP's === operator instead of hashequals. === on strings short circuits at the first differing byte, so the comparison time leaks how...

EUVD-2026-65215

Grav: Non constant time nonce comparison in Utils::verifyNonce used for CSRF protection...

GHSA-38P6-H87P-R4CG Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection

Summary Grav\Common\Utils::verifyNonce, the core function Grav and its plugins use to validate CSRF nonces, compares the submitted nonce to the expected value with PHP's === operator instead of hashequals. === on strings short circuits at the first differing byte, so the comparison time leaks how...

Timing Attack

Overview getgrav/grav is a Modern, Crazy Fast, Ridiculously Easy and Amazingly Powerful Flat-File CMS. Affected versions of this package are vulnerable to Timing Attack via the verifyNonce function. An attacker can recover valid nonce values by measuring response timing differences through multip...

Duplicate Advisory: Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-38p6-h87p-r4cg. This link is maintained to preserve external references. Original Description Grav CMS before 2.0.16 contains a timing vulnerability in Utils::verifyNonce that uses non-constant-time string...

CVE-2026-72701

Grav CMS before 2.0.16 is affected by a timing side-channel vulnerability in Utils::verifyNonce(). The function uses a non-constant-time string comparison (the === operator) instead of PHP's hash_equals() when validating CSRF nonces . An attacker can measure response-time differences across multi...

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

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 hashequals for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through...

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

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 hashequals for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through...

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

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 hashequals for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through...

CVE-2026-72701: Observable Timing Discrepancy

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 hashequals for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through...

PT-2026-81144

Name of the Vulnerable Software and Affected Versions Grav CMS versions prior to 2.0.16 Description An issue exists in the verifyNonce function of the Utils class where non-constant-time string comparison is performed using the === operator instead of hash equals for CSRF nonce validation. This...