Collected research

Stealing passwords from infosec Mastodon without bypassing CSP

Finds that emoji placeholder expansion after HTML filtering can break a title attribute and inject arbitrary markup into a Mastodon fork. With scripts blocked by CSP, hidden autofilled login fields and a spoofed action bar submit saved credentials to an attacker when the victim clicks.

Record

Published by

PortSwigger Research

Date

15 November 2022

In the archive

• Collected in the 2022 research round

Tags

• sanitizer-bypass
• html-injection
• autofill
• credential-theft
• csp
• account-takeover
• attack-chain
• owasp-a05-2021

This page is the archive's own catalogue record. The research is the work of PortSwigger Research, first published at the original source. Preserved copies are kept so the citation survives its host.