Auth bypass in Bitwarden Server
CVE-2026-71959
Bitwarden Server before 2026.7.2 does not verify that the caller is a member of the organization identified in a POST /collect request body, allowing any authenticated user to write forged, arbitrarily backdated entries into any organizati…
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
Affected products
- Bitwarden Server — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71959?
- CVE-2026-71959 is a medium-severity vulnerability in Bitwarden Server, classified under Missing Authorization. CVSS score: 5.8/10. Published 2026-08-10.
- How severe is CVE-2026-71959?
- Medium severity. CVSS v3 base score is 5.8 out of 10.