---
id: CVE-2026-83526
title: >-
  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
summary: >-
  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
  a…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
published: '2026-10-10'
updated: '2026-10-10'
sourceUpdated: '2026-10-10T06:16:43.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83526'
references:
  - url: 'https://github.com/foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8'
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/editor.php#L36
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/frontend.php#L1211
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L105
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L148
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L181
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db-video.php#L855
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1102
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1173
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L46
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/5c75cb7b-1ebe-411c-8664-848d741e40d4?source=cve
    label: security@wordfence.com
tags:
  - nvd
ingestedAt: '2026-10-10T06:24:42.870Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.