Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bitwarden | Server | < 2026.4.1 |
Related Weaknesses (CWE)
References
- https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476Patch
- https://github.com/bitwarden/server/pull/7394Issue TrackingPatch
- https://github.com/bitwarden/server/releases/tag/v2026.4.1Release Notes
- https://sanjokkarki.com.np/blog/bitwarden-import-org-bypassExploitThird Party Advisory
- https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-Third Party Advisory
FAQ
What is CVE-2026-43638?
CVE-2026-43638 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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-organiza...
How severe is CVE-2026-43638?
CVE-2026-43638 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43638?
Check the references section above for vendor advisories and patch information. Affected products include: Bitwarden Server.