The Betheme theme for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 28.4. This is due to the uploadicons() function workflow moving and unzipping user-controlled ZIP files into a public uploads directory without validating extracted file types. This makes it possible for authenticated attackers, with author-level access and above, to upload arbitrary files (including PHP) and achieve remote code execution via the Icons icon-pack upload flow.

The Betheme theme for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 28.4. This is due to the uploadicons() function workflow using a user-controlled upload path (mfn-icon-upload) in a filesystem move operation without constraining it to the uploads directory. This makes it possible for authenticated attackers, with contributor-level access and above, to move/delete arbitrary local files via path traversal.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in muffingroup Betheme betheme allows DOM-Based XSS.This issue affects Betheme: from n/a through <= 28.2.

The Betheme theme for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's Button shortcode and Custom CSS field in all versions up to, and including, 28.0.3 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Missing Authorization vulnerability in Muffin Group Betheme.This issue affects Betheme: from n/a through 27.1.1.