In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.
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In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.