CVE-2026-83526: FV Player 8 <= 8.1.7 - Authenticated (Subscriber+) Arbitrary File Upload via videos[].fv_wp_flowplayer_field_src Parameter

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-10 · updated 2026-10-28
Weakness: CWE-434

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.

Affected products

foliovision FV Player 8: through 8.1.7

References

Get alerted when CVE-2026-83526 or the next vulnerability affects your stack