#026 · Security ProfessionalsEpicLocked in

Robert Hansen

RSnake

The XSS Cheat Sheet

ha.ckers.org, Slowloris, and browser attack surface

Rating

85Impact score
Technical depth90
Defensive craft84
Research92
Influence86
FromUSA
Era2005–present

Domains

Cross-site scriptingBrowser securityDenial of service

Scouting report

Ran ha.ckers.org and published the XSS cheat sheet, which for years was the reference list of filter-evasion payloads that every web application firewall was tested against. Co-authored XSS Attacks with Grossman, released Slowloris to demonstrate that a single machine could hold a web server’s connections open indefinitely, and co-wrote Detecting Malice on behavioural detection.

Curator’s note

The cheat sheet did more for input validation than any standards document.