CVE-2026-117554: medium-severity vulnerability in admidio
Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.3%
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.
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
Affected products
admidio · admidioReferences
https://github.com/Admidio/admidiohttps://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9https://github.com/Admidio/admidio/issues/2231https://github.com/Admidio/admidio/releases/tag/v5.0.17https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qghttps://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php