---
cve: "CVE-2026-57520"
severity: "HIGH"
cvss: 7.1
epss: "0.6%"
vendor: "Bitwarden"
kev: false
exploited: false
published: "2026-06-25 20:17:17"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-10T08:22:04+02:00"
---

# CVE-2026-57520

> 7.1 HIGH · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- c3cabffccfe35004f5022f91f95cc0fb5e8aa7c4 (Commit)
- 901bb67157c0f80d369c40b76742fdf7623da4e4 (Commit)

## BSI-Hinweise (deutsch)

- [Bitwarden: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2095) — _BSI-Einstufung: mittel_
  Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Bitwarden ausnutzen, um Daten zu manipulieren oder Informationen offenzulegen.

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-57520/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_