Description

Admidio before 5.0.17 contains an improper access control vulnerability that allows authenticated members to register event guests by submitting the additional_guests field when guests are disallowed. Attackers can set additional_guests to the remaining seat count in modules/events/events_function.php to exhaust event capacity and block other members from registering.

Related CPE's

Could not find any relations

References

https://github.com/Admidio/admidio

https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462

https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9

https://github.com/Admidio/admidio/issues/2231

https://github.com/Admidio/admidio/releases/tag/v5.0.17

https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg

https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php

Weaknesses

[email protected]

Primary
CWE-602

CVSS impact metrics

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

4.3 · Medium

Information

Source identifier

[email protected]

Vulnerability status

Deferred

Published

2026-10-27T14:16:35.990Z

4 hours ago

Last modified

2026-10-27T14:16:36.110Z

4 hours ago