---
id: CVE-2026-111912
title: Admidio 5.0.0 before 5.0.16 IDOR via Forum Topic Update
summary: >-
  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
  paramete…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: Admidio
product: admidio
affected:
  - admidio >= 5.0.0 < 5.0.16
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T18:46:29.658Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111912'
references:
  - url: 'https://github.com/Admidio/admidio/security/advisories/GHSA-8256-4wm7-f628'
    label: GitHub Security Advisory (GHSA-8256-4wm7-f628)
  - url: >-
      https://www.vulncheck.com/advisories/admidio-5.0.0-before-5.0.16-idor-via-forum-topic-update
    label: >-
      VulnCheck Advisory: Admidio 5.0.0 before 5.0.16 IDOR via Forum Topic
      Update
tags:
  - cve.org
ingestedAt: '2026-10-17T19:08:56.737Z'
---

## Overview

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.

## Affected

- `admidio >= 5.0.0 < 5.0.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.