CVE-2026-91846: MISP Collection Element Add Missing Authorization on Referenced Object UUID

Versions reported by the vendor

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

• MISP MISP

  • before 2.5.46affected · semver

Other highest-scoring records for the same primary product.

• CVE-2026-103655MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period
  37Monitor
• CVE-2026-90961MISP LdapAuth and LinOTPAuth Authentication Bypass via Empty or Non-String Credentials
  37Monitor
• CVE-2026-56422MISP Core: Mass Assignment and Object Re-ownership via Unvalidated Request Fields
  37Monitor

Published before and after this one in the same product

• ← EarlierCVE-2026-91819Sep 15, 2026 · MISP: HTTP Method Override Bypasses CSRF and Form Validation in BetterSecurityComponent
  27Monitor
• ← EarlierCVE-2026-91825Sep 15, 2026 · MISP: Missing Authorization Check for Event Sharing Group When Distribution Field Is Omitted During Edit
  28Monitor
• Later →CVE-2026-91851Sep 15, 2026 · MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison
  21Monitor

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.