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Medium severity · published May 11, 2026
CVE-2026-43638
Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
server · bitwarden
before 2026.4.1 · source: vendor, NVD
Affected product
SE
server
bitwarden
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43638
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43638
Patch
https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758
Issue Tracking
https://github.com/bitwarden/server/pull/7394
Release Notes
https://github.com/bitwarden/server/releases/tag/v2026.4.1
Exploit
https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass
Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import
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