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).
Published: 2026-05-11
Score: 8.9 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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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'}


Subscriptions

Bitwarden Server
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 : Awaiting Analysis

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

Modified: 2026-05-13T15:29:03.597

Link: CVE-2026-43639

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses