CVE-2026-43640: Incorrect Implementation of Authentication Algorithm in bitwarden server
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.
AI Analysis
Technical Summary
CVE-2026-43640 describes an authentication bypass vulnerability in Bitwarden Server before version 2026.4.1. The issue arises because the server does not enforce master-password re-authentication when an authenticated user with SCIM management privileges attempts to retrieve or rotate the organization's SCIM API key. This flaw enables such users to obtain the SCIM API key without additional verification beyond their existing session authentication.
Potential Impact
An attacker who has authenticated access with SCIM management privileges can retrieve or rotate the SCIM API key without needing to re-authenticate with the master password. This could lead to unauthorized use of the SCIM API key, potentially compromising organizational integrations and exposing sensitive data accessible via SCIM.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The vulnerability is fixed starting from version 2026.4.1. Users should upgrade to version 2026.4.1 or later to mitigate this issue. Until patched, restrict SCIM management privileges to trusted users only.
CVE-2026-43640: Incorrect Implementation of Authentication Algorithm in bitwarden server
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 v4.0
Score 8.6high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43640 describes an authentication bypass vulnerability in Bitwarden Server before version 2026.4.1. The issue arises because the server does not enforce master-password re-authentication when an authenticated user with SCIM management privileges attempts to retrieve or rotate the organization's SCIM API key. This flaw enables such users to obtain the SCIM API key without additional verification beyond their existing session authentication.
Potential Impact
An attacker who has authenticated access with SCIM management privileges can retrieve or rotate the SCIM API key without needing to re-authenticate with the master password. This could lead to unauthorized use of the SCIM API key, potentially compromising organizational integrations and exposing sensitive data accessible via SCIM.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The vulnerability is fixed starting from version 2026.4.1. Users should upgrade to version 2026.4.1 or later to mitigate this issue. Until patched, restrict SCIM management privileges to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-05-01T18:22:45.642Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a021aa7cbff5d8610430524
Added to database: 05/11/2026, 18:06:31 UTC
Last enriched: 07/15/2026, 10:33:27 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 110
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