CVE-2026-83526: FV Player 8 arbitrary file upload vulnerability
high 8.8 published 2026-10-10 · updated 2026-10-28
- Affected versions
- 8.1.7 and older
- Fixed in
- unknown
- Latest version
- 8.1.9
- Severity
- High · CVSS 8.8
- Active installs
- 1,000+
- Type
- Arbitrary file upload
What an attacker needs
- Access: A logged-in account with Subscriber-level access or higher.
CVSS vector (score by Wordfence): CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What to do now
- Update FV Player 8 to the latest version (8.1.9). The record does not name a fixed version, so also read the advisory below.
- If you cannot update right away, deactivate it until you can.
- Not sure which version you run? Check your version against every known FV Player 8 issue.
With WP-CLI:
wp plugin get fv-player --field=version. - If you ran an affected version and something looks off (new admin users, spam pages, redirects), run the free scan below.
The advisory
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
- NVD CVE-2026-83526 nvd.nist.gov
- Wordfence advisory www.wordfence.com
- github.com github.com
- Plugin source plugins.trac.wordpress.org
Related
Ran an affected version? Check your site for signs of a hack
The free scan reads the public side of your site and looks for spam pages, hidden redirects, injected scripts and blacklist entries. No login, no install, about a minute.
Where this data comes from
- CVE record, score and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
- Versions and install counts: wordpress.org/plugins/fv-player (Plugins API), fetched 2026-11-04.
- The summary, “what an attacker needs” and “what to do” sections are our plain-English reading of the record and the plugin's release history; the quoted description is the record's own text. Spot an error? Email Daniel.