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Server CVE-2026-43638

| EUVDEUVD-2026-29130 MEDIUM
Missing Authorization (CWE-862)
2026-05-11 VulnCheck GHSA-vvm4-hc77-cqmc
Authentication Bypass Server
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
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

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

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

DescriptionCVE.org

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. Publicly available exploit code exists, and the vendor has released patched version 2026.4.1.

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CVE-2026-43638 vulnerability details – vuln.today
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