CVE-2026-43638

EUVD-2026-29130
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 8%
Affected Products (NVD)
VendorProductVersion
bitwardenserver
𝑥
< 2026.4.1
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
bitwardenbitwarden
𝑥
< 2026.4.1
CNA
Common Weakness Enumeration
References
https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758
https://github.com/bitwarden/server/pull/7394
https://github.com/bitwarden/server/releases/tag/v2026.4.1
https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import