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CVE-2026-82657 – Unauthenticated Sensitive Information Disclosure – Admidio before 5.0.12

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Summary

CVE-2026-82657 is an authentication-bypass / information-disclosure vulnerability in Admidio, an open-source user management system for organizations and groups. The RSS feed endpoints for the forum and announcements modules fail to enforce the "login-only" access restriction that the corresponding interactive module pages already enforce, allowing unauthenticated users to read member-only forum posts and announcements. The issue is rated HIGH severity (CVSS v3.1 7.5, CVSS v4.0 8.7) and affects all Admidio installations prior to version 5.0.12.

Technical details

  • Root cause: rss/forum.php and rss/announcements.php only check whether a module is fully disabled (mode 0); they do not check for the "login-only" restriction (mode 2) that the module’s normal web pages enforce.
  • Trigger condition: The forum or announcements module is configured to require login ("registered users only"), while the site’s RSS/web feed feature remains enabled.
  • Attack vector: Network-based; an unauthenticated attacker sends a plain GET request to the RSS feed URL for the forum or announcements module — no credentials, prior access, or user interaction required.
  • Impact: Disclosure of thread titles, full post bodies, author names, timestamps, and category information from modules intended to be restricted to registered members. A related, earlier fix (GHSA-cf48-6jrq-gjcm) closed this gap for the interactive module pages but did not update the RSS endpoints.

Affected software

  • Admidio versions up to and including 5.0.11

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 Base Score: 8.7 (HIGH)
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-306: Missing Authentication for Critical Function

Mitigation and recommended actions

  • Immediate: Upgrade Admidio to version 5.0.12 or later, which enforces the login-only restriction on the RSS feed endpoints.
  • If patching is not immediately possible: Disable the site-wide "Enable web feeds" (RSS) setting, or set the forum and announcements modules to fully disabled rather than login-only until the upgrade can be applied, to prevent the RSS endpoints from serving restricted content to unauthenticated requests.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • set-cookie response header: admidio
  • Page title: Admidio
  • Raw response body: /adm_program/, /adm_my_files/

References

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