CVE-2026-72702

Summary

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 Software

Weaknesses

• CWE-346: Origin Validation Error

References

• https://github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33
• https://www.vulncheck.com/advisories/grav-cms-before-origin-validation-bypass-via-referer

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