CVE WatchNov 5, 2026

CVE-2026-121139

The Rapid7 Metasploit msf-ws suffers from a missing authentication vulnerability whereby the REST API grants an unauthenticated "bootstrap"

CVSS

7.8

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 5, 2026 · Last modified: Nov 5, 2026 · CWE-306

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

github.comhttps://github.com/rapid7/metasploit-framework/pull/22039

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