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

Quick assessment

Affected
bitwarden server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bitwarden server是美国Bitwarden公司开源的一款密码管理服务器软件。 Bitwarden Server 2026.5.0之前版本存在授权问题漏洞，该漏洞源于批量用户移除端点缺少角色层次检查，可能导致经过身份验证的具有ManageUsers权限的Custom用户移除组织中的Admin账户。

CVSS 7.1 · High EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
bitwarden server < 2026.5.0 affected
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I. Basic Information for CVE-2026-57520

Vulnerability Information
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Vulnerability Title
Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Bitwarden Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bitwarden server是美国Bitwarden公司开源的一款密码管理服务器软件。 Bitwarden Server 2026.5.0之前版本存在授权问题漏洞，该漏洞源于批量用户移除端点缺少角色层次检查，可能导致经过身份验证的具有ManageUsers权限的Custom用户移除组织中的Admin账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bitwarden server 0 ~ 2026.5.0 -

II. Public POCs for CVE-2026-57520

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9034 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-57520

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Patches & Fixes for CVE-2026-57520 (2)

Vendor Advisories for CVE-2026-57520 (1)

Security Blog Posts for CVE-2026-57520 (1)

Vendor Pages for CVE-2026-57520 (1)

Same Patch Batch · bitwarden · 2026-06-25 · 3 CVEs total

CVE-2026-57521 4.3 MEDIUM Bitwarden Server < 2026.5.0 Broken Access Control via PreviewInvoiceController
CVE-2026-57522 3.5 LOW Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates

IV. Related Vulnerabilities

Same product: server
Same vendor: bitwarden
Same weakness: CWE-862

V. Comments for CVE-2026-57520

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