{"id":"CVE-2026-57520","title":"Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint","summary":"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 …","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","cvssSource":"cna","cwe":["CWE-862"],"vendor":"bitwarden","product":"server","affected":["server < 2026.5.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-30T03:30:43.781292Z"},"exploitAvailable":true,"published":"2026-06-25","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:06:31.404Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57520","references":[{"url":"https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin"},{"url":"https://github.com/bitwarden/server/releases/tag/v2026.5.0","label":"server 2026.5.0 Release Notes"},{"url":"https://github.com/bitwarden/server/pull/7526"},{"url":"https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4"},{"url":"https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint"}],"tags":["cve.org","exploit-available"],"epss":0.00639,"epssPercentile":0.50872,"ingestedAt":"2026-11-08T14:51:22.326Z","slug":"CVE-2026-57520","body":"## Overview\n\nBitwarden 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.\n\n## Affected\n\n- `server < 2026.5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}