CVE-2026-83526
FV Player 8 <= 8.1.7 - Authenticated (Subscriber+) Arbitrary File Upload via videos[].fv_wp_flowplayer_field_src Parameter
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.
INFO
Published Date :
Oct. 10, 2026, 6:16 a.m.
Last Modified :
Oct. 28, 2026, 5:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update FV Player plugin to the latest version.
- Remove any unauthorized files from the uploads directory.
- Implement stricter file type validation.
- Enforce capability checks for player creation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-83526.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-83526 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-83526
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-83526 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-83526 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Oct. 28, 2026
Action Type Old Value New Value Changed 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. 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. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 11, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-83526', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-11T16:43:03.315494Z'} -
New CVE Received by [email protected]
Oct. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-434 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/83xxx/CVE-2026-83526.json">CVE-2026-83526</a> Added Reference https://github.com/foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/editor.php#L36 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/frontend.php#L1211 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L105 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L148 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L181 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db-video.php#L855 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1102 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1173 Added Reference https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L46 Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/5c75cb7b-1ebe-411c-8664-848d741e40d4?source=cve