CVE-2026-57520: Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
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.
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L · CWE-862
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
bitwarden: server
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 (opens in new tab)
- github.com/bitwarden/server/pull/7526 (opens in new tab)
- github.com/bitwarden/server/releases/tag/v2026.5.0 (opens in new tab)
- sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin (opens in new tab)
- www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove… (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)