CVE-2026-57520
Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
- State
- Published
- Severity
- 7.1 High
- Published
- Jun 25, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L | VulnCheck |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
serverbitwarden |
|
References
- https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admintechnical-descriptionexploit
- https://github.com/bitwarden/server/releases/tag/v2026.5.0release-notes
- https://github.com/bitwarden/server/pull/7526issue-tracking
- https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4patch
- https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpointthird-party-advisory
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