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CVE-2026-43639— Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients

Quick assessment

Affected
bitwarden server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

bitwarden是Bitwarden开源的一款密码管理后端服务。 bitwarden 2026.4.0之前版本存在安全漏洞，该漏洞源于缺少授权检查，允许提供商服务用户将任意组织添加到其提供商，导致目标组织被接管。

CVSS 8.0 · High EPSS 0.84% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
bitwarden server < 2026.4.0 affected
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I. Basic Information for CVE-2026-43639

Vulnerability Information
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Vulnerability Title
Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
bitwarden 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
bitwarden是Bitwarden开源的一款密码管理后端服务。 bitwarden 2026.4.0之前版本存在安全漏洞，该漏洞源于缺少授权检查，允许提供商服务用户将任意组织添加到其提供商，导致目标组织被接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bitwarden server 0 ~ 2026.4.0 -

II. Public POCs for CVE-2026-43639

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III. Intelligence Information for CVE-2026-43639

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Patches & Fixes for CVE-2026-43639 (2)

Security Blog Posts for CVE-2026-43639 (1)

News Coverage for CVE-2026-43639 (1)

Vendor Pages for CVE-2026-43639 (1)

Same Patch Batch · bitwarden · 2026-05-11 · 3 CVEs total

CVE-2026-43640 8.1 HIGH Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
CVE-2026-43638 5.4 MEDIUM Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import

IV. Related Vulnerabilities

Same product: server
Same vendor: bitwarden
Same weakness: CWE-862

V. Comments for CVE-2026-43639

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