Improper Authentication in Admidio - CVE-2026-41671
Published: April 23, 2026
Vulnerability identifier: #VU127172
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-41671
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Admidio
Affected software:
Admidio
Admidio
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication on connected resource servers.
The vulnerability exists due to improper authentication in the OIDC token introspection endpoint when processing token validation requests. A remote attacker can submit a fabricated, expired, revoked, or empty token to bypass authentication on connected resource servers.
The issue affects the /modules/sso/index.php/oidc/introspect endpoint and has changed scope because the vulnerable authorization server can cause unauthorized access decisions in connected resource servers.
How to mitigate CVE-2026-41671
Install security update from vendor's website.