CVE-2026-72701

LOW 3.7

Grav CMS before 2.0.16 Timing Attack via verifyNonce

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-208
Vendor	getgrav
Product	grav
Published	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

getgrav / grav

0 < 2.0.16

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg vulncheck.com: https://www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce

Credits

🔍 alham-rizvi