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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.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-11 | Updated 2026-05-11 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem types

Missing Authorization

Product status

Default status
affected

Any version before 2026.4.1
affected

Credits

Sanjok Karki finder

References

sanjokkarki.com.np/blog/bitwarden-import-org-bypass technical-description exploit

github.com/bitwarden/server/releases/tag/v2026.4.1 release-notes

github.com/bitwarden/server/pull/7394 issue-tracking

github.com/...ommit/ebbf6dd0fa752114c09d73abb48ce32a50476758 patch

www.vulncheck.com/...rization-via-organization-cipher-import third-party-advisory

cve.org (CVE-2026-43638)

nvd.nist.gov (CVE-2026-43638)

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