Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

CVE-2026-72702Grav CMS before 2.0.16 Origin Validation Bypass via Referer

Medium 5.4

In plain English

A medium-severity security flaw in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.1%top 95.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Grav CMS before 2.0.16 contains an origin validation bypass in the Uri::referrer() and Pages::referrerRoute() methods, which validate the Referer header using an unanchored string prefix match (str_starts_with($referrer, $base)) with no trailing delimiter. An attacker who controls a domain that begins with the victim site's origin (e.g. https://example.com.attacker.tld) can send a request with such a Referer to be treated as same-origin, bypassing the Referer-based origin check.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	getgrav/grav	2.0.16	GHSA-9ccq-2jfg-qw33

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 2.0.16

Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-9ccq-2jfg-qw33) vendor-advisory
VulnCheck Advisory: Grav CMS before 2.0.16 Origin Validation Bypass via Referer third-party-advisory