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.
Severity (CVSS)
| Base score | 7.1 |
|---|---|
| Severity | High |
| Version | CVSS 4.0 |
| Vector | 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 |
| Provided by | CNA |
Weaknesses
- CWE-862 — Missing Authorization
Affected products
| Vendor | Product | Versions |
|---|---|---|
| bitwarden | server | 0 to <2026.5.0 |
References
- https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin (technical-description exploit)
- https://github.com/bitwarden/server/releases/tag/v2026.5.0 (release-notes)
- https://github.com/bitwarden/server/pull/7526 (issue-tracking)
- https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 (patch)
- https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint (third-party-advisory)
Generated from the official CVE List on 26 Jun 2026 07:05 UTC.