Vulnerability · Published May 7, 2026 · Assigned by GitHub_M

CVE-2026-41662Admidio: Missing Minimum Administrator Check in Role Membership Removal

Medium 5.2

In plain English

A medium-severity security flaw in admidio from Admidio. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.2Medium

Exploit odds (30 days)0.3%top 78.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Admidio is an open-source user management solution. Prior to version 5.0.9, Role::stopMembership() does not verify whether removing a user from the administrator role leaves zero administrators. The deprecated Membership::stopMembership() contains this safety check, but the current code path bypasses it. Any administrator can remove the last remaining other administrator, locking the entire system out of administrative access. The exploit does not require concurrent requests; sequential removals produce the same result. This issue has been patched in version 5.0.9.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	admidio/admidio	5.0.9	GHSA-c7xm-r6vj-8vg6

Affected products (as reported)

Vendor	Product	Versions
Admidio	admidio	< 5.0.9

Weakness: CWE-754 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:H

References

https://github.com/Admidio/admidio/security/advisories/GHSA-c7xm-r6vj-8vg6 x_refsource_CONFIRM
https://github.com/Admidio/admidio/releases/tag/v5.0.9 x_refsource_MISC