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WAF and web security bypass techniques

April 3, 2026张惠倩, cristi, Justin Gardner

张惠倩, cristi, and Justin Gardner share practical bypass and testing tricks, including URL encoding to evade path rules, probing CSP for S3 buckets, and case-sensitive payload nuances for CSPT testing.

use URL encoding `/%61%63%74%75%61%74%75%61%74%6f%72`
to bypass the WAF
If you see a CSP header with s3.amazonaws... or bucket names, test aws s3 ls s3://<bucketname>/ --no-sign-request.
Always test for CSPT with %252F, not %252f.
张惠倩
cristi
Justin Gardner
websecbypassbugbounty

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