Bitwarden Server < 2026.6.0 Authorization Bypass via Admin Auth Request

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• bitwarden serverbefore 2026.6.0

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.

• bitwarden server

  • before 2026.6.0affected · semver

Other highest-scoring records for the same primary product.

• CVE-2026-43639Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
  35Monitor
• CVE-2026-43640Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
  34Monitor
• CVE-2020-15879Bitwarden Server 1.35.1 allows SSRF because it does not consider certain IPv6 addresses (ones beginning with fc, fd, fe, or ff, and the :: a
  31Monitor
• CVE-2019-19766The Bitwarden server through 1.32.0 has a potentially unwanted KDF.
  30Monitor
• CVE-2026-57520Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
  28Monitor
• CVE-2026-71959Bitwarden Server < 2026.7.2 Audit Log Injection via POST /collect
  27Monitor

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.