CVE-2026-43638 MEDIUM

CVE-2026-43638: Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import

Vendor Bitwarden
Product server
Weakness CWE-862 · Missing authorization
Published May 11, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 11, 2026 Record updated