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CVE-2026-43638— Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import

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 2026.4.1之前版本存在安全漏洞，该漏洞源于缺少授权检查，允许任何经过身份验证的用户通过提交空collections数组向任意组织写入密码。

CVSS 5.4 · Medium EPSS 0.33% · P23

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
bitwarden server < 2026.4.1 affected
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I. Basic Information for CVE-2026-43638

Vulnerability Information
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Vulnerability Title
Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import
Source: CVE Program / CVE List V5
Vulnerability Description
Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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 2026.4.1之前版本存在安全漏洞，该漏洞源于缺少授权检查，允许任何经过身份验证的用户通过提交空collections数组向任意组织写入密码。
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 ~ 2026.4.1 -

II. Public POCs for CVE-2026-43638

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III. Intelligence Information for CVE-2026-43638

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Patches & Fixes for CVE-2026-43638 (2)

Vendor Advisories for CVE-2026-43638 (1)

Security Blog Posts for CVE-2026-43638 (1)

Vendor Pages for CVE-2026-43638 (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-2026-43639 8.0 HIGH Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-43638

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