This tweet shares a penetration testing tip regarding bypassing Web Application Firewall (WAF) protections. It suggests that instead of scanning JavaScript files directly on the target's live environment, testers can download and host those JS bundles locally on their machines. By doing so, they can bypass the WAF and detection mechanisms since the interaction doesn't go through the live protected server environment. This enables testers to perform deeper offline analysis on the scripts without interference or blocks from the WAF. Essentially, this method provides a way to evade security controls during testing by shifting the testing environment from live to local hosting of JS assets. It is a universal kind of technique potentially useful against any WAF vendor since it's a testing workflow adjustment rather than a payload-based exploit.
For more insights, check out the original tweet here: https://twitter.com/0xRAYAN7/status/1949406640698216454