CVE-2026-127016: MISP Modules Website: Missing Authorization on External Tool Management Endpoints
The MISP Modules website component exposes external tool management endpoints (add, delete, change status, and change configuration) that did not enforce the optional administrator authentication policy. When ADMINPASSWORD was configured in the application environment, the module configuration endpoints correctly required an authenticated administrator session, but the external tools management handlers processed requests from anonymous users without any authorization check. An unauthenticated attacker with network access to the website could add arbitrary external tools, delete existing tools, toggle their active status, and modify their configurations including API keys and ingestion URLs. This inconsistency allowed bypass of the intended access control for the external tools management functionality. The vulnerability is conditional on ADMINPASSWORD being set; installations without an admin password intentionally permit open management access by design. The affected component is the externaltools Flask blueprint within the MISP Modules website application.
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Add a before_request authorization handler that, when ADMIN_PASSWORD is configured, requires an authenticated administrator before external-tool add, delete, status, or configuration endpoints execute; redirect unauthenticated add requests to the login page and return HTTP 403 for delete, status, and configuration requests.
MISP Modules website external_tools Flask blueprint before_request authorization handler = enabled
Event History
Frequently Asked Questions
Which deployments are affected by this authorization bypass?
Deployments of the MISP Modules website are affected when ADMIN_PASSWORD is configured. Installations without an admin password intentionally allow open management access and are not affected by this specific policy bypass.
What does an attacker need to exploit it?
An attacker only needs network access to the MISP Modules website. No administrator credentials or user interaction are required.
What could an unauthorized attacker change?
They can add or delete external tools, enable or disable them, and alter their configurations. Configuration changes can include API keys and ingestion URLs.
How can I tell whether my deployment may be exposed?
Check whether the website application has ADMIN_PASSWORD set and whether the external_tools Flask blueprint is reachable over the network. If both are true, anonymous requests to external tool management functions may have been accepted.
What should be prioritized if patching cannot happen immediately?
Restrict network access to the MISP Modules website so untrusted users cannot reach the external tool management endpoints. Review external tool definitions and configurations, especially API keys and ingestion URLs, for unauthorized changes.