CVE-2026-30927: Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter

March 9, 2026 (updated March 10, 2026)

Register unwilling users for events (potential harassment/spam)
Cancel other users’ event participation
Manipulate event participant counts and comments
If events have participation limits, fill slots with unwanted registrations

References

github.com/Admidio/admidio
github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e
github.com/Admidio/admidio/issues/1985
github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw
github.com/advisories/GHSA-7pfv-hr63-h7cw
nvd.nist.gov/vuln/detail/CVE-2026-30927

Code Behaviors & Features

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