Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).

Project Subscriptions

Vendors Products
Bitwarden Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 11 May 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Bitwarden
Bitwarden server
Vendors & Products Bitwarden
Bitwarden server
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 11 May 2026 18:00:00 +0000

Type Values Removed Values Added
Description Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).
Title Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.9, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-11T19:14:22.085Z

Reserved: 2026-05-01T18:22:45.642Z

Link: CVE-2026-43639

cve-icon Vulnrichment

Updated: 2026-05-11T19:14:04.106Z

cve-icon NVD

Status : Received

Published: 2026-05-11T18:16:36.970

Modified: 2026-05-11T18:16:36.970

Link: CVE-2026-43639

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-11T20:00:13Z

Weaknesses