CVE-2026-83526

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.

• CWE-434

• https://github.com/foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8
• https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/editor.php#L36
• https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/frontend.php#L1211
• https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L105
• 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#L181
• https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db-video.php#L855
• https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1102
• 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#L46
• https://www.wordfence.com/threat-intel/vulnerabilities/id/5c75cb7b-1ebe-411c-8664-848d741e40d4?source=cve

Published

Oct 10, 2026

Last Modified

Oct 28, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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