Critical severity · published Aug 26, 2026
CVE-2026-80203
Grav before 1.0.18 Authentication Bypass via Scoped API Key
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
before 1.0.18 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80203
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-80203
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-94q7-vrqr-cx5v
www.vulncheck.com
https://www.vulncheck.com/advisories/grav-before-1.0.18-authentication-bypass-via-scoped-api-key
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