CVE-2026-83526 json
FV Player 8 <= 8.1.7 - Authenticated (Subscriber+) Arbitrary File Upload via videos[].fv_wp_flowplayer_field_src Parameter
published last mo. modified 14d ago also EUVD-2026-96092
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
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 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.
Patch / fix
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- last mo.
Exploit prediction
0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- foliovision FV Player 8
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/5c75cb7b-1ebe-411c-8664-848d741e40d4?source=cve
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/checker.php#L105
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/checker.php#L148
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/checker.php#L181
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/db.php#L46
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/db.php#L1102
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/db.php#L1173
- plugins.trac.wordpress.org /browser/fv-player/trunk/models/db-video.php#L855
- plugins.trac.wordpress.org /browser/fv-player/trunk/controller/editor.php#L36
- plugins.trac.wordpress.org /browser/fv-player/trunk/controller/frontend.php#L1211
- github.com /foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8
Sources
- CVE List CVE-2026-83526
- NVD CVE-2026-83526
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