CVE-2026-117554
Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| admidio admidio admidio/admidio
composer |
≥ 0; < 5.0.17 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: 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 | CNA: VulnCheck |
Exploit evidence
- https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg
exploit · ADP: CISA-ADP
References
- https://github.com/Admidio/admidio/issues/2231CNA: VulnCheck · issue-tracking
- https://github.com/Admidio/admidioCNA: VulnCheck · product
- https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qgCNA: VulnCheck · vendor-advisory
- https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9CNA: VulnCheck · patch
- https://github.com/Admidio/admidio/releases/tag/v5.0.17CNA: VulnCheck · release-notes
- https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-phpCNA: VulnCheck · third-party-advisory
- https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qgADP: CISA-ADP · exploit
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