CVE-2026-69090: Admidio Auth Bypass Vulnerability

CVE-2026-69090 Overview

CVE-2026-69090 is a missing authorization vulnerability [CWE-862] in Admidio versions before 5.0.11. The role handlers in groups_roles.php fail to validate that a supplied role belongs to the current organization. Authenticated role administrators can submit a role UUID from another organization to delete, activate, deactivate, or edit that organization's roles. The flaw undermines Admidio's multi-tenant boundary and enables cross-tenant integrity attacks by any user with role administrator privileges.

Critical Impact
An authenticated role administrator in one Admidio organization can modify or delete roles belonging to any other organization hosted on the same instance.

Affected Products

Admidio versions prior to 5.0.11
groups_roles.php role handlers (delete, activate, deactivate, edit)
Multi-organization Admidio deployments

Discovery Timeline

2026-08-03 - CVE-2026-69090 published to the National Vulnerability Database
2026-08-03 - Last updated in NVD database

Technical Details for CVE-2026-69090

Vulnerability Analysis

Admidio is an open-source membership management application that supports multiple organizations within a single deployment. Each organization maintains its own roles, members, and administrators. The groups_roles.php module exposes handlers that let role administrators perform lifecycle actions on roles, including delete, activate, deactivate, and edit.

The vulnerability stems from missing authorization checks in these handlers. The application resolves a role by its universally unique identifier (UUID) supplied by the client and executes the requested action. It does not verify that the target role belongs to the caller's active organization. An authenticated role administrator can enumerate or guess a role UUID from a different organization and pass it into the handler. The server processes the modification as if the caller were authorized.

The result is a cross-tenant integrity violation. Roles in unrelated organizations can be renamed, disabled, or deleted, disrupting group membership, permissions, and workflows for users outside the attacker's tenant.

Root Cause

The root cause is a broken access control pattern classified under [CWE-862] Missing Authorization. The affected handlers trust the object identifier supplied in the request and skip the tenancy check that binds a role to its owning organization. Authentication and role-administrator privilege are enforced, but scope is not.

Attack Vector

Exploitation requires network access to the Admidio web interface and an authenticated session with role administrator privileges in at least one organization. The attacker submits a crafted request to groups_roles.php with the role UUID of a target organization. No user interaction is required. Impact is limited to integrity: confidentiality and availability of the wider system are not directly affected, though disruption of authorization roles can produce downstream availability effects for the victim tenant.

Refer to the GitHub Security Advisory GHSA-fcq9-w4hp-xchg and the VulnCheck Advisory for handler-level technical details.

Detection Methods for CVE-2026-69090

Indicators of Compromise

Unexpected deletion, deactivation, or renaming of roles reported by administrators of an organization
HTTP POST requests to groups_roles.php handlers containing role UUIDs that do not belong to the requesting user's active organization
Role administrator sessions performing modifications shortly after switching or without switching organization context
Audit log entries showing role edits attributed to users who are not members of the affected organization

Detection Strategies

Correlate the acting user's organization membership with the owning organization of each modified role in application logs
Alert on any groups_roles.php request where the target role UUID resolves to an organization other than the session's current organization
Baseline normal role administration activity per tenant and flag cross-tenant deviations

Monitoring Recommendations

Enable Admidio audit logging for role create, edit, activate, deactivate, and delete events
Forward web server and application logs to a centralized analytics platform for cross-tenant correlation
Review privileged session activity for role administrators on a recurring cadence

How to Mitigate CVE-2026-69090

Immediate Actions Required

Upgrade Admidio to version 5.0.11 or later on all instances
Audit existing roles across every organization to identify unauthorized changes or deletions
Review the list of accounts holding role administrator privileges and revoke any that are unnecessary
Rotate credentials for role administrator accounts if unauthorized activity is suspected

Patch Information

The vendor addressed the missing authorization check in Admidio 5.0.11. The fix adds validation that the role UUID passed to groups_roles.php handlers belongs to the caller's active organization before any modification is executed. Deployment details are documented in the GitHub Security Advisory GHSA-fcq9-w4hp-xchg.

Workarounds

Restrict access to the Admidio administration interface to trusted networks until the patch is applied
Reduce the number of accounts assigned the role administrator permission across all organizations
Separate multi-tenant Admidio workloads into isolated instances where practical to eliminate cross-tenant exposure

bash

# Verify the installed Admidio version and confirm it is 5.0.11 or later
grep -R "ADMIDIO_VERSION" /var/www/admidio/adm_program/system/constants.php