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Advisories

Grav CMS before 2.0.16 Timing Attack via verifyNonce

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severity
low
date
Affecting

  • grav >= 0, < 2.0.16

CWE
  • CWE-208 Observable Timing Discrepancy
CVSS
6.3
CVSS V4 Vector
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
Credit
alham-rizvi
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.

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