Open-source package vulnerability · Composer (PHP)

GHSA-qh7h-6c7g-x8m6: Duplicate Advisory: Grav: Origin validation bypass in Uri::referrer() and Pages::referrerRoute() via unanchored prefix match

criticalCVSS 4.0 9.3 · 3.1 5.4

This advisory was withdrawn on Sep 17, 2026. The publisher no longer considers it a valid vulnerability.

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-9ccq-2jfg-qw33. This link is maintained to preserve external references. Original 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 (strstartswith($referrer, $base)) with no…

Published Aug 25, 2026 · Updated Sep 17, 2026

Affected packages

getgrav/grav

Ecosystem: Composer (PHP)
Affected: < 2.0.16
Fixed in: No patched version yet
Check: composer show getgrav/grav

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-9ccq-2jfg-qw33. This link is maintained to preserve external references.

Original 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.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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