CVE-2023-46251

Summary

CVE-2023-46251 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting the MyBB forum software. The issue lies in the visual editor (_SCEditor_) where input is not properly escaped when rendering HTML. Maliciously crafted BBCode messages can exploit this weakness, allowing attackers to inject malicious scripts into a victim's browser. The vulnerability may be triggered on pages where message content is pre-filled through a GET/POST parameter or on reply pages that quote a previously saved malicious message. The impact can be mitigated by disabling the visual editor globally or for individual user accounts. MyBB version 1.8.37 resolves this issue with commit `6dcaf0b4d`. Users are advised to upgrade or disable the visual editor and the account option "Show the MyCode formatting options on the posting pages" to prevent potential attacks.

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