CVE-2026-43638: Missing Authorization in bitwarden server
Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.
AI Analysis
Technical Summary
CVE-2026-43638 describes a missing authorization vulnerability in Bitwarden Server before version 2026.4.1. Authenticated users can exploit the endpoint POST /ciphers/import-organization by submitting an empty collections array, which causes the server to skip permission verification. This allows unauthorized writing of ciphers into organizations the user should not have access to. The vulnerability is rated medium severity with a CVSS 4.0 base score of 5.3. No vendor advisory or patch information is currently available, and the product is not a cloud service.
Potential Impact
An authenticated user can bypass authorization controls and write data into any organization within the Bitwarden Server. This could lead to unauthorized data modification or insertion within organizations, potentially impacting data integrity and confidentiality within the affected server environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict authenticated user permissions and monitor for suspicious activity related to the /ciphers/import-organization endpoint.
CVE-2026-43638: Missing Authorization in bitwarden server
Description
Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.
CVSS v4.0
Score 5.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43638 describes a missing authorization vulnerability in Bitwarden Server before version 2026.4.1. Authenticated users can exploit the endpoint POST /ciphers/import-organization by submitting an empty collections array, which causes the server to skip permission verification. This allows unauthorized writing of ciphers into organizations the user should not have access to. The vulnerability is rated medium severity with a CVSS 4.0 base score of 5.3. No vendor advisory or patch information is currently available, and the product is not a cloud service.
Potential Impact
An authenticated user can bypass authorization controls and write data into any organization within the Bitwarden Server. This could lead to unauthorized data modification or insertion within organizations, potentially impacting data integrity and confidentiality within the affected server environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict authenticated user permissions and monitor for suspicious activity related to the /ciphers/import-organization endpoint.
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: 6a021045cbff5d86103d46bb
Added to database: 05/11/2026, 17:22:13 UTC
Last enriched: 07/15/2026, 10:33:09 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 113
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