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GHSA-7pfv-hr63-h7cw

Published Mar 9, 2026·Last modified Mar 10, 2026
Affected Components(0)

No affected components available

Description

Vulnerability

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.

Line 47: $getUserUuid = admFuncVariableIsValid($_GET, 'user_uuid', 'uuid', ...) Line 424: if ($event->possibleToParticipate() || $participants->isLeader($gCurrentUserId))

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.

Impact

  • 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

Fix

For non-leader users, force user_uuid to the current user:

if (!$participants->isLeader($gCurrentUserId)) {
    $getUserUuid = $gCurrentUser->getValue('usr_uuid');
}
Risk Scores
Base Score
0.0

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists.

Threat Intelligence
0.0

No exploitation activity has been observed at this time. Continue routine monitoring.

EPSS
0.25%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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