Description
MyBB (aka MyBulletinBoard) 1.4.2 does not properly handle an uploaded file with a nonstandard file type that contains HTML sequences, which allows remote attackers to cause that file to be processed as HTML by Internet Explorer's content inspection, aka "Incomplete protection against MIME-sniffing." NOTE: this could be leveraged for XSS and other attacks.
Remediation
References
Related Vulnerabilities
WebLogic Deserialization of Untrusted Data Vulnerability (CVE-2022-23302)
WordPress Plugin Instant Images-One Click Unsplash Uploads Cross-Site Scripting (4.4.0)
SharePoint Unrestricted Upload of File with Dangerous Type Vulnerability (CVE-2020-0971)
Ruby Integer Overflow or Wraparound Vulnerability (CVE-2008-2663)