admidio up to 5.0.5 User Management events_function.php possibleToParticipate user_uuid authorization

Summaryinfo

A vulnerability marked as problematic has been reported in admidio up to 5.0.5. Affected by this vulnerability is the function possibleToParticipate of the file modules/events/events_function.php of the component User Management Handler. Performing a manipulation of the argument user_uuid results in authorization. This vulnerability is cataloged as CVE-2026-30927. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in admidio up to 5.0.5. It has been classified as problematic. This affects the function possibleToParticipate of the file modules/events/events_function.php of the component User Management Handler. The manipulation of the argument user_uuid with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-30927 since 03/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

By approaching the search of inurl:modules/events/events_function.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 5.0.6 eliminates this vulnerability.

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Productinfo

Name

• admidio

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5

Website

• Product: https://github.com/Admidio/admidio/

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