Auth bypass in Getgrav Grav
CVE-2026-80203
The getgrav/grav-plugin-api plugin before 1.0.18 does not enforce API-key scope in the requireNotSuperTarget() function in UsersController.php across seven sensitive user-management endpoints. The check uses isSuperAdmin() on the acting account rather than verifying whether the specific API key carries super authority (via isSuperWithinScope()). As a result, an API key scoped below full super authority but belonging to a super-admin account can act against other super-admin accounts—disabling their 2FA, deleting their avatar, minting new API keys under their identity, or deleting their existing API keys.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-94q7-vrqr-cx5v (vendor-advisory)
- www.vulncheck.com/advisories/grav-before-1.0.18-authentication-bypass-via-scope… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-80203?
- CVE-2026-80203 is a critical-severity vulnerability in Getgrav Grav, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-08-26.
- How severe is CVE-2026-80203?
- Critical severity. CVSS v3 base score is 9.8 out of 10.