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TI-2026-31740 Aliases CVE-2026-43638GHSA-vvm4-hc77-cqmc

Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import

Priority MEDIUM 57CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00188 8th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed server (bitwarden): 2026.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
bitwardenserverbefore 2026.4.12026.4.1Patch availableCNA
  • server Vendorbitwarden Affected before 2026.4.1 Fixed in 2026.4.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*before 2026.4.1Vulnerablebitwarden
  • cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:* Versions before 2026.4.1 Vulnerable ·bitwarden

Remediation

  • Fix · CNA server (bitwarden) Fixed in 2026.4.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    bitwarden server 2026.4.1

    2 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM

    Other records, highest priority first

    • TI-2026-31742 Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API KeyPriority HIGH 72
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43638
  2. 2026-10-03 Alias added: GHSA-vvm4-hc77-cqmc

References

Exploit 1

Patch 2

Other 1

  • TI-2026-42828 Bitwarden Server < 2026.6.0 Authorization Bypass via Admin Auth Request CVSS 4.0CRITICAL 9.3
  • TI-2026-31741 Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients CVSS 4.0HIGH 8.9
  • TI-2026-31742 Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key CVSS 4.0HIGH 8.6
  • TI-2026-41410 Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint CVSS 4.0HIGH 7.1
  • TI-2026-41411 Bitwarden Server < 2026.5.0 Broken Access Control via PreviewInvoiceController CVSS 4.0MEDIUM 5.3
  • TI-2026-41412 Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates CVSS 4.0LOW 2.3
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences