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MyBB Signature HTML Injection Vulnerability

MyBB is prone to an HTML injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in dynamically generated content.

Attacker-supplied HTML and script code would be executed in the context of the affected Web site, potentially allowing for theft of cookie-based authentication credentials. An attacker could also exploit this issue to control how the site is rendered to the user; other attacks are also possible.

The discoverer of this vulnerability has not disclosed which version or
versions of the application may be vulnerable to this issue. It is
conjectured this issue affects recent versions of MyBB.