Vulnerability · Published Aug 26, 2026 · Assigned by VulnCheck

CVE-2026-80203Grav before 1.0.18 Authentication Bypass via Scoped API Key

Critical 9.8

In plain English

A critical-severity incorrect authorization in grav from getgrav. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.5%top 56.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 1.0.18

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-94q7-vrqr-cx5v) vendor-advisory
VulnCheck Advisory: Grav before 1.0.18 Authentication Bypass via Scoped API Key third-party-advisory