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CVE-2026-83526— FV Player 8 <= 8.1.7 - Authenticated (Subscriber+) Arbitrary File Upload via videos[].fv_wp_flowplayer_field_src Parameter

Quick assessment

Affected
foliovision FV Player 8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 FV Player 8 插件在所有 8.1.7 及更早版本中，存在任意文件上传漏洞，该漏洞出现在 函数中。这一漏洞的原因在于 函数中对文件类型的验证不充分，它会在任何 MIME 类型或扩展名检查之前，将攻击者提供的远程文件内容写入公共上传目录；同时，在创建新播放器时缺少能力（权限）检查。这使得拥有订阅者及以上级别的认证攻击者能够上传可能可执行的文件，从而实现远程代码执行。然而，成功利用该漏洞需要竞态条件（race condition）也被成功触发。

CVSS 8.8 · High EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
foliovision FV Player 8 ≤ 8.1.7 affected
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I. Basic Information for CVE-2026-83526

Vulnerability Information
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Vulnerability Title
FV Player 8 <= 8.1.7 - Authenticated (Subscriber+) Arbitrary File Upload via videos[].fv_wp_flowplayer_field_src Parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
foliovision FV Player 8 0 ~ 8.1.7 -

II. Public POCs for CVE-2026-83526

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III. Intelligence Information for CVE-2026-83526

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Patches & Fixes for CVE-2026-83526 (3)

Vendor Advisories for CVE-2026-83526 (1)

Vendor Pages for CVE-2026-83526 (1)

Same Patch Batch · foliovision · 2026-10-10 · 3 CVEs total

CVE-2026-42699 7.1 HIGH WordPress FV Player 8 plugin <= 8.1.8 - Cross Site Scripting (XSS) vulnerability
CVE-2026-97630 6.4 MEDIUM FV Flowplayer Video Player <= 7.5.54.7212 - Authenticated (Subscriber+) Stored Cross-Site

IV. Related Vulnerabilities

Same product: FV Player 8
Same vendor: foliovision
Same weakness: CWE-434

V. Comments for CVE-2026-83526

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