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http://blog.intigriti.com/2019/08/06/bug-bytes-30-chaining-cache-poisoning-to-stored-xss-how-to-bypass-the-cloudflare-waf-ghostwriter-by-specterops/
Bug Bytes #30 – Chaining Cache Poisoning To Stored XSS, How To Bypass Cloudflare's WAF & Ghostwriter by SpecterOps