[MEDIUM] Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter

PKSA-m5mq-p62f-xpq3 CVE-2026-30927 GHSA-7pfv-hr63-h7cw

Affected package: admidio/admidio

Affected version: <5.0.6

Reported by:
GitHub