CVE-2026-109329: Admidio 4.3.2 through 4.3.17 and 5.0.0 before 5.0.15 Cross-Organization Access Control Bypass via members_assignment.php

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

• Admidio admidio

  • 5.0.15not affected
  • 4.3.2 and later · up to and including 4.3.17affected · semver
  • 5.0.0 and later · before 5.0.15affected · semver

Other highest-scoring records for the same primary product.

• CVE-2026-32817Admidio is Missing Authorization and CSRF Protection on Document and Folder Deletion
  36Monitor
• CVE-2026-32756Admidio: Unrestricted File Upload via CSRF Token Validation Bypass in Documents & Files Module
  35Monitor
• CVE-2024-38529Admidio Vulnerable to RCE via Arbitrary File Upload in Message Attachment
  35Monitor

Published before and after this one in the same product

• ← EarlierCVE-2026-109327Oct 12, 2026 · Admidio 4.0.12 through 4.3.17 and 5.0.0 before 5.0.15 Reflected XSS via system/redirect.php
  20Monitor
• ← EarlierCVE-2026-109328Oct 12, 2026 · Admidio 5.0.0 before 5.0.15 Unauthenticated Stored XSS via Registration Name
  21Monitor
• Later →CVE-2026-111912Oct 17, 2026 · Admidio 5.0.0 before 5.0.16 IDOR via Forum Topic Update
  28Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const invoice = await Invoice.findById(req.params.id);2res.json(invoice);

1const invoice = await Invoice.findOne({2  id: req.params.id,3  ownerId: req.user.id,4});5if (!invoice) return res.sendStatus(404);6res.json(invoice);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.