---
id: GHSA-px9v-979x-qmh9
title: >-
  Duplicate Advisory: Grav: Non constant time nonce comparison in
  Utils::verifyNonce() used for CSRF protection
summary: >-
  Duplicate Advisory: Grav: Non constant time nonce comparison in
  Utils::verifyNonce() used for CSRF protection
severity: medium
cvss: 3.7
cwe:
  - CWE-208
vendor: getgrav
product: getgrav/grav
ecosystem: composer
affected:
  - getgrav/grav < 2.0.16
published: '2026-08-25'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:24:50Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-px9v-979x-qmh9'
references:
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72701'
  - url: >-
      https://www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce
  - url: 'https://github.com/advisories/GHSA-px9v-979x-qmh9'
tags:
  - ghsa
  - composer
ingestedAt: '2026-09-17T20:28:02.779Z'
---

## Overview

### 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This advisory has been withdrawn because it is a duplicate of GHSA-38p6-h87p-r4cg.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 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

- `getgrav/grav < 2.0.16`

## Remediation

Refer to the advisory for the patched release.