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CVE-2026-83526

8.8 · HIGH

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.

Published Oct 10, 2026CWE-434EPSS 0.63%

Overview

CVE-2026-83526 is a high-severity vulnerability. It was published on October 10, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8Refplugins.trac.wordpress.org/browser/fv-player/trunk/controller/editor.php#L36Refplugins.trac.wordpress.org/browser/fv-player/trunk/controller/frontend.php#L1211Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L105Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L148Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L181Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/db-video.php#L855Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1102Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1173Refplugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L46

How CyberStrike helps

Frequently asked questions

What is CVE-2026-83526?

CVE-2026-83526 is a high-severity vulnerability. It was published on October 10, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-83526?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-83526?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-83526?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-83526 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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