Medium 4.3Published Oct 27, 2026

CVE-2026-117554Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php

Updated under an hour ago (Oct 30, 2026, 4:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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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: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-602
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

admidio admidio admidio:admidio (from the name)	before 5.0.17	CNA record

References

References

https://github.com/Admidio/admidio/issues/2231	issue-tracking
https://github.com/Admidio/admidio	product
https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg	vendor-advisory
https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9	patch
https://github.com/Admidio/admidio/releases/tag/v5.0.17	release-notes
https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462	technical-description
https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.