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 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.
CVE-2026-72701
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-72701
grav
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "getgrav",
"product": "grav",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.0.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "2.0.16",
"versionType": "semver"
}
],
"packageURL": "pkg:composer/getgrav/grav",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-72701
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12823 · Revision 1
- Added to Heist Feed
- Publisher date