Collected research

Cross domain content extraction with fake captcha

A UI-redressing refinement of Firefox's view-source: framing bug. Rather than make the victim drag a page's HTML source, the attacker frames view-source: so one line of the victim page sits inside a fake CAPTCHA field; a triple click selects the whole source line and the user copy-pastes it, leaking anti-CSRF tokens cross-domain.

Record

Published by

blog.kotowicz.net

Topic

Browser

In the archive

• Collected in the 2011 research round

Related sources

• Cross-domain content extraction
• Cross-domain content extraction source

Tags

• ui-redress
• clickjacking
• iframe
• sop-bypass
• csrf
• info-leak
• owasp-a01-2021
• owasp-a04-2021

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