CVE-2026-43638

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 4.0

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

CVSS 3.1

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

EPSS

0.2% chance of exploitation in the next 30 days; higher than 8% of CVEs (scores of 2026-10-26)

CWE

CWE-862

Published

2026-05-11

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• bitwarden:server

References

• https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758
• https://github.com/bitwarden/server/pull/7394
• https://github.com/bitwarden/server/releases/tag/v2026.4.1
• https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass
• https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import

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