This tweet shares a WAF bypass technique as part 1 of a series. The exact vendor of the Web Application Firewall (WAF) is not mentioned, nor is the specific type of vulnerability targeted (e.g., SQL Injection, Cross-Site Scripting, Remote Code Execution). However, it appears to be a general bypass method that can be useful in bug bounty hunting. The payload details are presented via an external link, thus not directly visible in the tweet. For bug bounty hunters, studying such techniques can expand their skill set in bypassing WAFs during security testing. Although details are minimal in the tweet itself, readers are encouraged to follow the link for complete technical content, and to stay tuned for further parts in this series. Using simple language: Web Application Firewalls are security tools meant to block malicious traffic to web applications. Sometimes, attackers find ways to trick or bypass these Firewalls to send harmful data successfully. This tweet hints at one such trick to bypass these firewalls, which could help security researchers find weaknesses.
For more insights, check out the original tweet here: https://twitter.com/bountywriteups/status/1940412406255300737