Preliminary research

Invalid Signed HTTP Exchange fallback navigation: SekaiCTF Filtered Reality

SekaiCTF 2026: Filtered Reality — Solution

dimasma0305 · Project Sekai

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

Solves a constrained reflected-content challenge using an invalid Signed HTTP Exchange body as a fallback navigation source. The navigation changes the Accept header and combines with reflected Content-Type and CSP conditions, illustrating how unsigned fallback behavior can supply a redirect primitive within a larger challenge chain.

Record

Document

SekaiCTF 2026: Filtered Reality — Solution

Researcher

dimasma0305

Published by

Project Sekai

Format

Code

Topic

HTTP

In the archive

• Collected in the 2026 preliminary research sweep

Related sources

• Filtered Reality solver and helper scripts

Tags

• http
• content-type
• csp
• open-redirect
• xss
• attack-chain
• owasp-a03-2021
• owasp-a04-2021
• owasp-a05-2021

This page is the archive's own catalogue record. The research is the work of dimasma0305, 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.