CVE-2026-43638: Bitwarden Server

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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

• Bitwarden Server: before 2026.4.1 (fixed in 2026.4.1)

Published 2026-05-11. Last modified 2026-07-14.