Vulnerability in Getgrav Grav
CVE-2026-72702
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.001 (3.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33 (vendor-advisory)
- www.vulncheck.com/advisories/grav-cms-before-origin-validation-bypass-via-refer… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72702?
- CVE-2026-72702 is a medium-severity vulnerability in Getgrav Grav, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2026-08-25.
- How severe is CVE-2026-72702?
- Medium severity. CVSS v3 base score is 5.4 out of 10.