CVE-2026-57520: Missing Authorization in bitwarden server
Bitwarden Server before 2026.5.0 contains a privilege escalation vulnerability that allows authenticated Custom users with ManageUsers permission to remove Admin accounts from an organization by exploiting a missing role hierarchy check in the bulk user-remove endpoint. Attackers can supply Admin organization-user IDs in a bulk DELETE request to bypass the guard enforced on the single-user removal path, effectively removing one or more Admin accounts from an organization.
AI Analysis
Technical Summary
CVE-2026-57520 is a privilege escalation vulnerability in Bitwarden Server before version 2026.5.0. The issue arises from a missing role hierarchy check in the bulk user-remove API endpoint. Authenticated users who have ManageUsers permission but are not Admins can exploit this by submitting bulk DELETE requests containing Admin organization-user IDs. This bypasses the protections present in the single-user removal path, enabling the removal of Admin accounts from the organization without proper authorization.
Potential Impact
The vulnerability allows authenticated users with ManageUsers permission to escalate their privileges by removing Admin accounts from an organization. This can disrupt administrative control and potentially degrade the security posture of the affected Bitwarden Server instance. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict ManageUsers permissions to trusted users only and monitor user removal activities closely to detect any unauthorized actions.
CVE-2026-57520: Missing Authorization in bitwarden server
Description
Bitwarden Server before 2026.5.0 contains a privilege escalation vulnerability that allows authenticated Custom users with ManageUsers permission to remove Admin accounts from an organization by exploiting a missing role hierarchy check in the bulk user-remove endpoint. Attackers can supply Admin organization-user IDs in a bulk DELETE request to bypass the guard enforced on the single-user removal path, effectively removing one or more Admin accounts from an organization.
CVSS v4.0
Score 7.1high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-57520 is a privilege escalation vulnerability in Bitwarden Server before version 2026.5.0. The issue arises from a missing role hierarchy check in the bulk user-remove API endpoint. Authenticated users who have ManageUsers permission but are not Admins can exploit this by submitting bulk DELETE requests containing Admin organization-user IDs. This bypasses the protections present in the single-user removal path, enabling the removal of Admin accounts from the organization without proper authorization.
Potential Impact
The vulnerability allows authenticated users with ManageUsers permission to escalate their privileges by removing Admin accounts from an organization. This can disrupt administrative control and potentially degrade the security posture of the affected Bitwarden Server instance. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict ManageUsers permissions to trusted users only and monitor user removal activities closely to detect any unauthorized actions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-24T15:58:58.537Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3d89044853345fc16510ab
Added to database: 06/25/2026, 20:01:08 UTC
Last enriched: 07/15/2026, 10:18:44 UTC
Last updated: 08/09/2026, 17:21:21 UTC
Views: 118
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