CVE-2026-117554

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductAdmidio

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-602CWE-602

How to fix

Update

admidio admidio5.0.17 or later

Patches

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

Vendor advisories

Affected products

Product	Affected versions	Fixed in
admidio admidio	v < 5.0.17	5.0.17

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