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

CVSS 8.0 · High EPSS 0.04% · P13

Affected Version Matrix 1

VendorProductVersion RangeStatus
bitwardenserver< 2026.4.0affected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
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

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

CVE-2026-436408.1 HIGHBitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
CVE-2026-436385.4 MEDIUMBitwarden 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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