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 breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality (Vulnerable System)
Low
Integrity (Vulnerable System)
Low
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected products
- bitwarden / server0 – 2026.4.1
References
- MISChttps://sanjokkarki.com.np/blog/bitwarden-import-org-bypass
- PATCHhttps://github.com/bitwarden/server/releases/tag/v2026.4.1
- PATCHhttps://github.com/bitwarden/server/pull/7394
- PATCHhttps://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758
- VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import