CVE-2026-43638

medium

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.

References

https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import

https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass

https://github.com/bitwarden/server/releases/tag/v2026.4.1

https://github.com/bitwarden/server/pull/7394

https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758

Details

Source: Mitre, NVD

Published: 2026-05-11

Updated: 2026-05-16

Risk Information

CVSS v2

Base Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

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

Severity: Medium

CVSS v4

Base Score: 5.3

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

Severity: Medium

EPSS

EPSS: 0.00028