Missing Authentication for Critical Function in Admidio - #VU138935
Published: July 21, 2026
Vulnerability identifier: #VU138935
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-306
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 disclose sensitive information.
The vulnerability exists due to missing authentication for a critical function in /modules/forum.php when handling unauthenticated requests to read-only forum modes. A remote attacker can send a specially crafted HTTP GET request with mode parameters to disclose sensitive information.
The issue occurs only when the forum module is configured in login-only mode, and read operations such as cards, list, and topic are exposed without authentication.
Remediation
Install security update from vendor's website.