Detections
Analytics
CVE-2026-83526
high
Description
The FV Player 8 plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 8.1.7 via the check_mimetype function. This is due to insufficient file type validation in check_mimetype(), which writes attacker-supplied remote file content to the public uploads directory before any MIME or extension check, combined with a missing capability check on new player creation. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. This requires successfully exploiting a race condition, and is only exploitable if the '[fvplayer_editor]' shortcode is present, or the "Enable profile videos" setting is enabled.
References
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L46
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1173
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1102
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db-video.php#L855
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L181
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L148
https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L105
https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/frontend.php#L1211
https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/editor.php#L36
https://github.com/foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8