This tweet discusses a general bypass technique affecting Web Application Firewalls (WAFs) related to the order of processing requests. It states that model access controls can bypass standard WAF inspections because WAFs typically inspect inputs before certain model-level controls are applied. Specifically, input validation occurs only after the edge processing is done by the WAF, allowing potentially malicious inputs to pass through the WAF unchecked. This kind of bypass is not specific to any one vulnerability type such as XSS, SQLi, or RCE, but is more of an architectural limitation in how WAFs are positioned in the request processing pipeline. Understanding this limitation is important for security professionals because it highlights that relying solely on a standard WAF for security enforcement is insufficient, and that robust input validation and access control mechanisms need to be implemented at multiple layers beyond the WAF. This helps ensure comprehensive protection against attacks that might circumvent traditional WAF inspection.
For more details, check out the original tweet here: https://twitter.com/EdgeDetectOps/status/2036141115175301502