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Bitwarden Server CVE-2026-43638

| EUVD-2026-29130 MEDIUM
Missing Authorization (CWE-862)
2026-05-11 VulnCheck GHSA-vvm4-hc77-cqmc
Authentication Bypass
5.3
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
CVSS changed
May 11, 2026 - 18:22 NVD
5.4 (MEDIUM) 5.3 (MEDIUM)
Source Code Evidence Fetched
May 11, 2026 - 18:01 vuln.today
Analysis Generated
May 11, 2026 - 18:01 vuln.today
CVE Published
May 11, 2026 - 17:13 nvd
MEDIUM 5.4

DescriptionNVD

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.

AnalysisAI

Bitwarden Server prior to v2026.4.1 allows any authenticated user to write ciphers (encrypted credentials) into arbitrary organizations via the POST /ciphers/import-organization endpoint by submitting an empty collections array, bypassing authorization checks. This missing authorization vulnerability (CWE-862) affects all authenticated users regardless of organization membership, enabling them to inject malicious credentials or pivot across organizations. …

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CVE-2026-43638 vulnerability details – vuln.today
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