PT-2026-52574 · Bitwarden · Server

Sanjok Karki · Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-57520

Mitre

CVSS v3.1

7.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

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.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-57520

Affected Products

Server

References · 6

• 🔥 https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin · Exploit
• https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-57520 · Security Note
• https://github.com/bitwarden/server/pull/7526 · Note
• https://github.com/bitwarden/server/releases/tag/v2026.5.0 · Note
• https://vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint · Note