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In this video with Matan Berson, we go through a universal yet previously undocumented technique of exploiting a self-XSS by doing more than just reading a previously opened page.
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Timestamps:
00:00 Intro
00:47 A conventional way to exploit a self-XSS
09:32 How does the browser prioritize cookies?
12:13 What's Cookie Jar overflow?
14:07 How to serve attacker's account self-XSS while logged in to victim's session?
19:34 How to exploit this when the self-XSS is not on a commonly visited page?