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Flexbe Subdomain Takeover

By kannthu

Vidoc logoVidoc Module

What is the "Flexbe Subdomain Takeover?"

The "Flexbe Subdomain Takeover" module is designed to detect subdomain misconfigurations that could potentially lead to a takeover. It specifically targets the Flexbe software. This module has a high severity level, indicating the potential impact of a successful subdomain takeover. The original author of this module is 0x_Akoko.


A subdomain takeover can have serious consequences for a website. It allows an attacker to gain control over a subdomain that is not properly configured, potentially leading to unauthorized access, data breaches, or other malicious activities. It is crucial to address subdomain misconfigurations promptly to prevent any security incidents.

How the module works?

The "Flexbe Subdomain Takeover" module works by performing HTTP requests and evaluating specific matching conditions. It checks for the following conditions:

- The host is not the same as the IP address. - The domain is not properly configured. - The HTTP response status is 404 (Not Found).

If all of these conditions are met, the module considers the subdomain vulnerable to takeover. It then triggers the specified action, which in this case is to report the vulnerability.

Here is an example of an HTTP request that the module might send:

GET / HTTP/1.1

This request is used to check if the subdomain responds with a 404 status code, indicating that it is not properly configured.

It is important to note that this module is just one test case within the Vidoc platform, which utilizes multiple modules to perform comprehensive scanning and detection of various vulnerabilities, misconfigurations, and software fingerprints.

Module preview

Concurrent Requests (0)
Passive global matcher
dsl: Host != ipand
word: Domain isn't configured, flexbeand
status: 404
On match action
Report vulnerability