---
id: "CVE-2026-111912"
kind: "vulnerability"
aliases: ["CVE-2026-111912"]
title: "Admidio: forum topic IDOR lets members overwrite other users' topics"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["admidio", "package", "php", "self-hosted"]
not_affected_if: ["admidio-5.0.16-or-later", "no-forum-use", "no-member-accounts"]
published_at: "2026-10-17T19:16:33+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-25T03:36:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111912", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# Admidio: forum topic IDOR lets members overwrite other users' topics

Admidio versions 5.0.0 before 5.0.16 fail to check ownership in ForumService::saveTopic(), so a logged-in member can change the topic_uuid in their own request. That lets them overwrite another member's forum topic title and first post.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Admidio version in the admin panel or in the `version` file of the install, and see if it is below `5.0.16`.
- Confirm whether the forum module is enabled and used for member discussions.

## Fix

- Upgrade Admidio to `5.0.16` or later.

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111912

## From the sources

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.

---

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