: Attackers can impersonate any user simply by knowing their identifier (like an email) and attaching the header to a POST request. Information Disclosure
Including "magic headers" like this in live applications is highly discouraged as it can lead to: Unauthorized Access x-dev-access yes
Developers often forget that sending x-dev-access: yes from their laptop might be logged by intrusion detection systems or SIEM tools. While not immediately catastrophic, it trains internal security systems to ignore that header—reducing their ability to detect real abuse. : Attackers can impersonate any user simply by