Vulnerability · Published Jun 25, 2026 · Assigned by VulnCheck

CVE-2026-57520Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint

High 7.1

In plain English

A high-severity missing authorization in server from bitwarden. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.6%top 49.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
bitwarden	server	0 – before 2026.5.0

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin technical-description, exploit
https://github.com/bitwarden/server/releases/tag/v2026.5.0 release-notes
https://github.com/bitwarden/server/pull/7526 issue-tracking
https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 patch
https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint third-party-advisory