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CVE-2026-121139— Rapid7 Metasploit Framework Web Service unauthenticated bootstrap window allows creation of an administrator account without authentication

Quick assessment

Affected
Rapid7 Metasploit Framework
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rapid7 的 Metasploit msf-ws 组件存在一个缺失身份验证的漏洞。该漏洞源于 REST API 为“初始化（bootstrap）”场景提供了未经验证的豁免机制，以便在用户表为空时创建第一位管理员。当用户表为空时， 接口按设计免除了身份验证要求：其路由处理器会调用 ，该方法解析为 。而继承自 的 方法在检测到 为 时，会直接短路并返回 ，完全跳过了 中对管理员权限的检查。在这种状态下，该接口允许任何未经验证的调用者创建用户，包括拥有管理员权限的用户。 此问题已在版本 6.5.9 中修复。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-121139

Vulnerability Information
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Vulnerability Title
Rapid7 Metasploit Framework Web Service unauthenticated bootstrap window allows creation of an administrator account without authentication
Source: CVE Program / CVE List V5
Vulnerability Description
The Rapid7 Metasploit msf-ws suffers from a missing authentication vulnerability whereby the REST API grants an unauthenticated "bootstrap" exemption so that the very first administrator can be created when the users table is empty. While the table is empty, POST /api/v1/users is exempt from authentication by design: the route handler calls warden.authenticate!(scope: :admin_api), which resolves to AdminApiToken. The inherited ApiToken#authenticate! short-circuits and returns success!() whenever msf.auth_initialized is false, without ever evaluating AdminApiToken's administrator check. In that state the endpoint creates a user — including an administrator — for an entirely unauthenticated caller. This issue has been fixed in version 6.5.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Rapid7 Metasploit Framework 0 ~ 6.5.9 -

II. Public POCs for CVE-2026-121139

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III. Intelligence Information for CVE-2026-121139

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Other References for CVE-2026-121139 (1)

IV. Related Vulnerabilities

Same product: Metasploit Framework
Same vendor: Rapid7
Same weakness: CWE-306