Top 10 winner

Forging HTTP request headers with Flash

Amit Klein · SecurityFocus / Bugtraq · 24 July 2006

Amit Klein's Bugtraq write-up on Flash's LoadVars.addRequestHeader, which lets a movie set arbitrary HTTP request headers from the browser. Forging an Expect header reaches an Apache flaw that reflects the header value into the error response, turning any site on a vulnerable server into a cross-site scripting target regardless of its own code.

Record

Researcher

Amit Klein

Published by

SecurityFocus / Bugtraq

Date

24 July 2006

Topic

HTTP

In the archive

• Ranked #6 in the 2006 Top 10 Web Hacking Techniques

Tags

• flash
• http
• header-injection
• csrf
• xss
• request-smuggling
• owasp-a01-2021
• owasp-a03-2021

This page is the archive's own catalogue record. The research is the work of Amit Klein, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 10 September 2026.