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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| bitwarden | server | < 2026.4.1 | 2026.4.1 |
Advisories 1
- WID-SEC-2026-1465 Bitwarden: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
References
- https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass technical-description exploit
- server 2026.4.1 Release Notes release-notes
- https://github.com/bitwarden/server/pull/7394 issue-tracking patch
- https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758 patch
- https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import third-party-advisory