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CVE-2026-82655 – Pre-Authentication Blind SQL Injection – Admidio ≤ 5.0.11

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Summary

CVE-2026-82655 is a pre-authentication blind SQL injection vulnerability in Admidio, the open-source membership/user management platform used by organizations and clubs to run their websites. The flaw resides in the relation_type_list parameter of /modules/groups-roles/lists_show.php and allows unauthenticated remote attackers to extract entire database contents, including user password hashes. The issue affects all Admidio versions prior to 5.0.12 and carries a CVSS v3.1 base score of 7.5 (High) / CVSS v4.0 score of 8.7.

Technical details

  • Root cause: The relation_type_list request parameter is concatenated directly into a SQL query (via string implosion) without parameterization or input validation, unlike the neighboring role_list parameter which does validate UUID format.
  • Trigger condition: An attacker can bypass Admidio’s normal authorization checks on lists_show.php by supplying a dummy, format-valid UUID in the role_list field, reaching the vulnerable code path without needing to log in.
  • Attack vector: Network-based, unauthenticated, no user interaction required (blind boolean-based SQL injection).
  • Impact: Full compromise of the underlying database — including extraction of user credentials, password hashes, and personally identifiable information stored by the application.

Affected software

  • Admidio versions 5.0.11 and all earlier releases
  • Fixed in Admidio 5.0.12 and later

Severity

  • CVSS v3.1 Base Score: 7.5 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • (A CVSS v4.0 score of 8.7 has also been assigned to this CVE.)

Mitigation and recommended actions

  • Immediate: Upgrade Admidio to version 5.0.12 or later, which parameterizes the affected query and validates the relation_type_list input.
  • If patching is not immediately possible: Restrict or block external network access to /adm_program/modules/groups-roles/lists_show.php at the web server or reverse proxy/WAF layer until the upgrade can be applied; monitor logs for anomalous requests containing SQL metacharacters in the relation_type_list or role_list parameters.
  • Review database logs and user credential stores for signs of prior exploitation, and rotate credentials/password hashes if compromise is suspected.

References

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