Cross-organization member disclosure via weaker endpoint authorization
Published May 7, 2026 · Updated May 7, 2026
Incorrect authorization in Admidio before 5.0.9 allows remote authenticated users to read member records across organizations. The contacts_data.php handler accepts mem_show_filter=3 after isAdministratorUsers(), omits the stronger isAdministrator() and contacts_show_all checks, and generates a query without organization filtering. A non-administrator user manager with rol_edit_user in a shared multi-organization database can obtain names, email addresses, login names, UUIDs, and configured profile fields for other organizations.
Summary
What happened
Incorrect authorization in Admidio before 5.0.9 allows remote authenticated users to read member records across organizations. The contacts_data.php handler accepts mem_show_filter=3 after isAdministratorUsers(), omits the stronger isAdministrator() and contacts_show_all checks, and generates a query without organization filtering. A non-administrator user manager with rol_edit_user in a shared multi-organization database can obtain names, email addresses, login names, UUIDs, and configured profile fields for other organizations.
The record
- CVE
- CVE-2026-41657
- Published
- May 7, 2026
- Updated
- May 7, 2026
- Vendor
- Admidio
- Product
- Admidio
- Classifications
- CWE-863, T1213
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 7, 2026CVE publishedPublication date reported by the CVE source.
- May 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 5.0.9
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA authenticated contacts_data.php proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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