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CVE-2026-43639 Details

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).

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d	[email protected]	Patch
https://github.com/bitwarden/server/pull/7372	[email protected]	Issue TrackingPatch
https://github.com/bitwarden/server/releases/tag/v2026.4.0	[email protected]	Release Notes
https://sanjokkarki.com.np/blog/bitwarden-provider-takeover	[email protected]	ExploitThird Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-862	Missing Authorization	[email protected]

Affected Products

Product	Versions
bitwarden server	< 2026.4.0
CPE cpe:2.3:a:bitwarden:server:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jul 14, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
May 16, 2026	Initial Analysis	[email protected]
May 11, 2026	New CVE Received	[email protected]