Matan · Security · Exposure

Version disclosure

Server and X-Powered-By headers that include versions help attackers pick exploits.

Pass condition in our engine: No versioned Server header and no X-Powered-By.

1. Problem description

We flag Server values that contain digits and any X-Powered-By. Hiding versions is security through obscurity — still worth doing, but not a substitute for patching.

2. Most common causes

  • nginx/1.18.0 default.
  • X-Powered-By: Express or PHP/8.x.

3. How to fix it

  1. server_tokens off; remove X-Powered-By in the app.
  2. Generalise Server to a generic name if your host allows it.

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