Vulnerability · Published May 11, 2026 · Assigned by VulnCheck
CVE-2026-43640Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
High 8.1
In plain English
A high-severity security flaw in server from bitwarden. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.5%top 56.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, allowing an authenticated user with SCIM management privileges to obtain the key using only a valid session.
Affected products (as reported)
Weakness: CWE-303 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References
- https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypass technical-description, exploit
- https://github.com/bitwarden/server/releases/tag/v2026.4.1 release-notes
- https://github.com/bitwarden/server/pull/7403 issue-tracking
- https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083 patch
- https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-key third-party-advisory