Auth bypass in Admidio
CVE-2026-111912
Admidio from 5.0.0 before 5.0.16 contains an insecure direct object reference vulnerability in ForumService::saveTopic() that allows authenticated members to modify other users' forum topics. Attackers can replace the topic_uuid parameter in their own topic_save request, reusing their CSRF token, to overwrite the victim topic's title and first post.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Admidio/admidio/security/advisories/GHSA-8256-4wm7-f628 (vendor-advisory)
- www.vulncheck.com/advisories/admidio-5.0.0-before-5.0.16-idor-via-forum-topic-u… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111912?
- CVE-2026-111912 is a medium-severity vulnerability in Admidio, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-10-17.
- How severe is CVE-2026-111912?
- Medium severity. CVSS v3 base score is 6.5 out of 10.