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.

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-25)

CWE

CWE-434

Published

2026-10-10

Modified

2026-10-13

Record from

the NVD, synced 2026-10-19

References

• 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

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