Collected research

Cross-subdomain Cookie Attacks

Skeptikal.org: Cross-subdomain Cookie Attacks

Mike Bailey · skeptikal.org

Announces a Toorcon talk and paper on client-side trust in subdomains. Cookie scoping implements its security policy backwards, granting a subdomain more trust than its parent rather than less as the DNS hierarchy would suggest. Proofs of concept target Google's then-new CSRF protection and Expedia; both were fixed before publication.

Record

Document

Skeptikal.org: Cross-subdomain Cookie Attacks

Researcher

Mike Bailey

Published by

skeptikal.org

Topic

Identity

In the archive

• Collected in the 2009 research round

Related sources

• Cross-Subdomain Cookie Attacks Whitepaper

Tags

• cookie
• csrf
• dns
• same-origin-policy
• auth-bypass
• case-study
• owasp-a01-2021
• owasp-a07-2021

This page is the archive's own catalogue record. The research is the work of Mike Bailey, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 9 August 2026.