CVE-2026-117554
Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 27, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-602 Client-Side Enforcement of Server-Side Security
Affected Products
| Product | Versions |
|---|---|
admidioadmidio |
|
References
- GitHub Issue #2231issue-tracking
- https://github.com/Admidio/admidioproduct
- GitHub Security Advisory (GHSA-92g9-59rr-c3qg)vendor-advisory
- https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9patch
- admidio v5.0.17 Release Notesrelease-notes
- https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462technical-description
- VulnCheck Advisory: Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.phpthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.