Preliminary research

Shazzer XSS: blob origins, failed cleanup and sandbox navigation

Finding XSS on Shazzer (literally)

Jorian Woltjer · Jorian Woltjer

AI-collected research leads through 22 September 2026, including targeted additions between broader sweeps. Unranked, incomplete, not community-vetted, and subject to change.

Follows a parent-origin blob through a null-origin sandbox. A structured-clone exception prevents cleanup, preserving a leaked object URL for user-mediated navigation; a clean same-origin popup then changes the CSP context. Failed attempts clarify how origin, lifetime and navigation interact in the resulting XSS chain.

Record

Document

Finding XSS on Shazzer (literally)

Researcher

Jorian Woltjer

Published by

Jorian Woltjer

Topic

XSS

In the archive

• Collected in the 2026 preliminary research sweep

Tags

• xss
• same-origin-policy
• sandbox-escape
• csp
• postmessage
• attack-chain
• owasp-a01-2021
• owasp-a03-2021
• owasp-a05-2021

This page is the archive's own catalogue record. The research is the work of Jorian Woltjer, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 13 September 2026.