CVE-2026-117554
Published:October 27, 2026
Updated:October 30, 2026
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.
Affected Packages
https://github.com/Admidio/admidio.git (GITHUB):
Affected version(s) >=v5.0-Beta.1 <v5.0.17Fix Suggestion:
Update to version v5.0.17admidio/admidio (PHP):
Affected version(s) >=v5.0-Beta.1 <v5.0.17Fix Suggestion:
Update to version v5.0.17Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Client-Side Enforcement of Server-Side Security
EPSS
Base Score:
0.29