Vulnerability · Published May 11, 2026 · Assigned by VulnCheck
CVE-2026-43638Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import
Medium 5.4
In plain English
A medium-severity missing authorization in server from bitwarden. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 91.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
References
- https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass technical-description, exploit
- https://github.com/bitwarden/server/releases/tag/v2026.4.1 release-notes
- https://github.com/bitwarden/server/pull/7394 issue-tracking
- https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758 patch
- https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import third-party-advisory