X-dev-access Yes [2021] «PROVEN · 2025»

Inject dev-only features at runtime based on authenticated user identity, not an HTTP header. A developer logs in with their SSO account, and the feature flag service knows to enable verbose logging for that specific user session.

Modifying the Host header or adding custom override headers can trick applications into generating URLs pointing to malicious domains, enabling phishing attacks and password reset poisoning. x-dev-access yes

To exploit this, you must manually inject the header into your request to the server. There are two primary ways to do this: 1. Using Browser Developer Tools Inject dev-only features at runtime based on authenticated