Vulnerability in Bitwarden Server
CVE-2026-43640
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (42.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Bitwarden Server — versions 0
Weakness classification (CWE)
References
- sanjokkarki.com.np/blog/bitwarden-scim-key-bypass (Exploit, technical-description, Third Party Advisory, exploit)
- github.com/bitwarden/server/releases/tag/v2026.4.1 (release-notes, Release Notes)
- github.com/bitwarden/server/pull/7403 (issue-tracking, Patch, Issue Tracking)
- github.com/bitwarden/server/commit/eb251d9bf80724c87b187661783b9354d1784083 (Patch, patch)
- www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-scim-ap… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-43640?
- CVE-2026-43640 is a high-severity vulnerability in Bitwarden Server, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.1/10. Published 2026-05-11.
- How severe is CVE-2026-43640?
- High severity. CVSS v3 base score is 8.1 out of 10.