High severity · published May 11, 2026
CVE-2026-43640
Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
8.1
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
server · bitwarden
before 2026.4.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43640
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43640
Patch
https://github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083
Issue Tracking
https://github.com/bitwarden/server/pull/7403
Release Notes
https://github.com/bitwarden/server/releases/tag/v2026.4.1
Exploit
https://sanjokkarki.com.np/blog/bitwarden-scim-key-bypass
Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-api-key
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