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Advisories

Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint

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severity
high
date
Affecting

  • server < 2026.5.0

CWE
  • CWE-862 Missing Authorization
CVSS
7.1
CVSS V4 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
Credit
Sanjok Karki
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.

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