CVE-2026-32818 in admidio
Summary
by MITRE • 03/20/2026
Admidio is an open-source user management solution. In versions 5.0.0 through 5.0.6, the forum module in Admidio does not verify whether the current user has permission to delete forum topics or posts. Both the topic_delete and post_delete actions in forum.php only validate the CSRF token but perform no authorization check before calling delete(). Any authenticated user with forum access can delete any topic (with all its posts) or any individual post by providing its UUID. This is inconsistent with the save/edit operations, which properly check isAdministratorForum() and ownership before allowing modifications. Any logged-in user can permanently and irreversibly delete any forum topic (including all its posts) or any individual post by simply knowing its UUID (which is publicly visible in URLs), completely bypassing authorization checks. This issue has been fixed in version 5.0.7.
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Analysis
by VulDB Data Team • 03/23/2026
The vulnerability identified as CVE-2026-32818 affects Admidio version 5.0.0 through 5.0.6 and represents a critical authorization bypass flaw within the forum module. This issue stems from inadequate access control validation during delete operations, creating a significant security risk for organizations relying on the platform for user management and community forums. The flaw specifically impacts the forum.php script where both topic_delete and post_delete actions fail to implement proper authorization checks before executing deletion functions.
The technical implementation of this vulnerability demonstrates a clear failure in the principle of least privilege and proper access control enforcement. While the system correctly validates CSRF tokens to prevent cross-site request forgery attacks, it completely neglects to verify user permissions before allowing deletion operations. The authorization checks that are properly implemented for save and edit operations are entirely absent from the delete functionality, creating an asymmetric security model. This inconsistency allows any authenticated user with forum access to exploit the system by simply knowing the UUID of a target topic or post, which are publicly visible in URLs.
The operational impact of this vulnerability is severe and far-reaching, as it enables any logged-in user to permanently delete forum content without restriction. This includes the ability to remove entire topics along with all associated posts, or delete individual posts, creating irreversible damage to community discussions and organizational data. The vulnerability's exploitability is particularly concerning because UUIDs are publicly exposed in URLs, making it trivial for attackers to identify and target specific content. This flaw undermines the integrity of forum data and could potentially be leveraged for information destruction or disruption of community services, especially in environments where forum content represents important organizational knowledge or user-generated content.
From a cybersecurity perspective, this vulnerability maps directly to CWE-285 (Improper Authorization) and aligns with ATT&CK technique T1485 (Data Destruction) and T1566 (Phishing). The lack of authorization checks during delete operations constitutes a fundamental security flaw that violates core security principles and could be exploited by both malicious insiders and external attackers. Organizations using affected versions of Admidio face significant risk of data loss and potential reputational damage, as the system's ability to maintain forum content integrity is completely compromised.
The mitigation strategy involves upgrading to version 5.0.7, which implements proper authorization checks for delete operations. This fix should include verification of user permissions through the existing isAdministratorForum() function and ownership validation before allowing any deletion activities. System administrators should also implement monitoring for unauthorized deletion activities and consider implementing additional access controls or audit logging to detect potential exploitation attempts. The fix addresses the root cause by ensuring that delete operations follow the same authorization patterns as save and edit operations, maintaining consistency in the security model and preventing unauthorized access to critical forum functionality.