Auth bypass in Admidio
CVE-2026-41671
Admidio is an open-source user management solution. Prior to version 5.0.9, the OIDC token introspection endpoint (/modules/sso/index.php/oidc/introspect) always returns {"active": true} for every request, regardless of whether a valid tok…
Vulnerability class: Broken Authentication
EPSS: 0.000 (5.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N.
Affected products
- Admidio — versions < 5.0.9
Weakness classification (CWE)
References
- https://github.com/Admidio/admidio/releases/tag/v5.0.9 (x_refsource_MISC)
- https://github.com/Admidio/admidio/security/advisories/GHSA-9xx5-cv6j-x533 (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-41671?
- CVE-2026-41671 is a medium-severity vulnerability in Admidio, classified under Improper Authentication. CVSS score: 6.8/10. Published 2026-05-07.
- How severe is CVE-2026-41671?
- Medium severity. CVSS v3 base score is 6.8 out of 10.