CVE-2026-57520

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductBitwarden Server

PublishedJun 25, 2026

First seenJun 25, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

bitwarden server2026.5.0 or later

Patches

github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4

Vendor advisories

github.com/bitwarden/server/releases/tag/v2026.5.0

Affected products

Product	Affected versions	Fixed in
bitwarden server	v < 2026.5.0	2026.5.0

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