CVE-2026-82658 in Admidio
Summary
by MITRE • 08/30/2026
Admidio versions before 5.0.12 contain a broken access control vulnerability in profile_function.php that allows authenticated low-privilege users to read another user's future role memberships. Attackers can bypass profile-level authorization by directly calling the reload_future_memberships endpoint with a victim's user UUID to disclose sensitive membership information.
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Analysis
by VulDB Data Team • 08/30/2026
Admidio, a widely used open-source community management software, suffers from a critical broken access control vulnerability in versions prior to 5.0.12. This flaw resides within the profile_function.php module and specifically affects the handling of user role memberships. The core issue stems from an insufficient authorization check on server-side endpoints that are intended for managing future organizational roles. While the application correctly restricts most profile-related actions based on user privileges, it fails to validate whether the authenticated caller has permission to view or manipulate data belonging to other users when accessing specific administrative functions related to role assignments.
The technical mechanism of this vulnerability involves a direct object reference weakness where the system relies solely on client-supplied identifiers without verifying ownership. An attacker who possesses valid credentials for a low-privilege account can interact with the reload_future_memberships endpoint by supplying the universally unique identifier (UUID) of any other user in the database. Because the backend logic does not cross-reference this UUID against the current session's permissions or verify that the requester is authorized to view such data, the server processes the request and returns sensitive membership information. This bypasses standard profile-level authorization controls, effectively allowing unauthorized access to private organizational structures.
The operational impact of this vulnerability allows authenticated attackers with minimal privileges to disclose confidential membership details for other users within the community platform. Future role memberships often indicate upcoming positions, leadership transitions, or planned responsibilities that are not yet public knowledge. Exposure of this data can lead to privacy violations and potentially aid in social engineering attacks by revealing internal hierarchies and future organizational changes before they are officially announced. This undermines trust among community members and compromises the integrity of administrative planning processes managed through the platform.
This vulnerability aligns with CWE-284, which describes Improper Access Control, as well as CWE-639 regarding Authorization Bypass Through User-Controlled Key. In terms of offensive security frameworks, it maps to MITRE ATT&CK technique T1078, specifically Valid Accounts, where an attacker uses legitimate credentials to access resources they are not authorized to view. To mitigate this risk, administrators must upgrade Admidio to version 5.0.12 or later immediately. The patch implements strict server-side validation that ensures only users with appropriate administrative privileges can query future membership data for other accounts. Additionally, implementing principle of least privilege and regularly auditing API endpoint permissions can help prevent similar access control failures in community management software.