CVE-2026-69091: Admidio before 5.0.11 Authentication Bypass via forum.php

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-03 · updated 2026-09-09
Weakness: CWE-306

Description

Admidio before 5.0.11 contains an authentication bypass vulnerability in the forum module when configured in login-only mode. The access control logic in modules/forum.php fails to validate the login-only configuration state, allowing unauthenticated attackers to read forum topics and posts by directly accessing the module with read-only parameters.

Affected products

admidio: before 5.0.11 — fixed in 5.0.11

How to fix

Upgrade to a fixed version: admidio 5.0.11. Check the vendor advisory for mitigations.

References

https://github.com/Admidio/admidio/security/advisories/GHSA-cf48-6jrq-gjcm
https://www.vulncheck.com/advisories/admidio-before-authentication-bypass-via-forum-php

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