WAFs don't perform content analysis of JavaScript files, and especially if the malicious payload originates from a 3rd party URL, the WAF would not live in the flow of the request. They only validate that the HTTP request itself to the web server appears legitimate. When a third-party script gets updated with malicious code, your WAF treats it the same as any other update from that trusted domain. WAFs lack the capability to hash, analyze, or compare script versions to detect when legitimate code becomes compromised, which is exactly how supply chain attacks like Polyfill succeed.
Can cside work alongside my existing WAF without conflicts?
We monitor an entirely different dimension of the application stack; hence, there is no interference.
How does cside solve the client-side blind spot that WAFs can't address?
Cside analyses every third-party script on our side before it runs, making it easy to stop attacks by analyzing JavaScript content asynchronously and hashing a list of bad scripts, preventing them from being loaded again.
Why is the browser environment invisible to WAF monitoring?
A WAF (Web Application Firewall) operates at the perimeter, analyzing traffic as it crosses between external networks and your internal network towards your web servers.
Can a WAF protect against supply chain attacks on third-party JavaScript libraries?
WAFs cannot protect against client-side supply chain attacks because they don't intercept the fetch to the 3rd party endpoint and therefore have no visibility into the JavaScript files from the 3rd party sources.