What’s Vulnerable › Vulnerabilities

CVE-2026-41657: Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts_data.php

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-07 · updated 2026-06-17
• Weakness: CWE-863

Description

Admidio is an open-source user management solution. Prior to version 5.0.9, the contacts_data.php endpoint uses a weaker permission check (isAdministratorUsers(), requiring only rol_edit_user=true) than the frontend UI (contacts.php) which correctly requires the stronger isAdministrator() (requiring rol_administrator=true) and the contacts_show_all system setting. A user manager who is not a full administrator can directly request contacts_data.php?mem_show_filter=3 to retrieve all user records across all organizations in the Admidio instance, bypassing multi-tenant organization isolation. This issue has been patched in version 5.0.9.

Affected products

• admidio: before 5.0.9

References

• https://github.com/Admidio/admidio/releases/tag/v5.0.9
• https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr
• https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr

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