CVE-2026-57520: Bitwarden Server

High severity, CVSS 7.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Bitwarden Server: before 2026.5.0 (fixed in 2026.5.0)

Published 2026-06-25. Last modified 2026-07-14.