CVE-2026-73612: File Browser before v2.63.22 Authorization Bypass via Recursive Operations

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.

• filebrowser filebrowser

  • 2.63.22not affected
  • before 2.63.22affected · semver

Other highest-scoring records for the same primary product.

• CVE-2026-32760File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin
  40Plan
• CVE-2026-34528File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution
  39Monitor
• CVE-2026-72839filebrowser through 2.63.16 Privilege Escalation via Signup
  37Monitor

Published before and after this one in the same product

• ← EarlierCVE-2026-62685Jul 15, 2026 · File Browser: Colliding username normalization gives two users the same home directory
  32Monitor
• ← EarlierCVE-2026-62843Jul 15, 2026 · File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)
  27Monitor
• Later →CVE-2026-73613Aug 13, 2026 · filebrowser before 2.63.19 Out-of-Scope File Deletion via Symlink
  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.