CVE-2026-30927

Admidio is an open-source user management solution. Prior to 5.0.6, in modules/events/events_function.php, the event participation logic allows any user who can participate in an event to register OTHER users by manipulating the user_uuid GET parameter. The condition uses || (OR), meaning if possibleToParticipate() returns true (event is open for participation), ANY user - not just leaders - can specify a different user_uuid and register/cancel participation for that user. The code then operates on $user->getValue('usr_id') (the target user from user_uuid) rather than the current user. This vulnerability is fixed in 5.0.6.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e	Patch
https://github.com/Admidio/admidio/issues/1985	Issue Tracking
https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:admidio:admidio:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-10 17:40

Updated : 2026-03-13 14:45

NVD link : CVE-2026-30927

Mitre link : CVE-2026-30927

CVE.ORG link : CVE-2026-30927

JSON object : View

Products Affected

admidio

admidio

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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