CVE-2026-72702

Medium

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.

SeverityMedium

CVSS5.4

Exploit probability—

ProductGetgrav/grav

PublishedAug 25, 2026

First seenAug 25, 2026

Weakness typeCWE-346CWE-346

How to fix

Update

getgrav/grav2.0.16 or later

Vendor advisories

github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33

Affected products

Product	Affected versions	Fixed in
getgrav/gravPackagist	v < 2.0.16	2.0.16

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