CVE-2026-75837: Grav: Missing admin.super guard on core group blueprint access field allows admin.users operator to escalate to super-admin

Severity: Critical

CVSS Score: 9.1

Grav before 2.0.14 fails to guard the access field in the core group blueprint with the required security@: admin.super restriction. A delegated admin.users operator can save a group with access[admin][super]=true to escalate to super-admin, gaining scheduler and Twig evaluation capabilities.