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CVE-2026-54416— Pluck CMS - Unrestricted File Upload via Missing .php8 Extension in Upload Blacklist

Quick assessment

Affected
pluck-cms Pluck CMS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pluck-cms Pluck CMS是Pluck-cms团队的一款轻量级内容管理系统。 Pluck CMS 4.7.21及之前版本存在任意文件上传漏洞，该漏洞源于文件上传功能使用固定黑名单但遗漏了.php8扩展名，可能导致经过身份验证的管理员上传shell.php8文件，在PHP 8.x服务器上被当作PHP执行，从而实现远程代码执行。

CVSS 7.2 · High EPSS 0.50% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
pluck-cms Pluck CMS ≤ 4.7.21 affected
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I. Basic Information for CVE-2026-54416

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Pluck CMS - Unrestricted File Upload via Missing .php8 Extension in Upload Blacklist
Source: CVE Program / CVE List V5
Vulnerability Description
Pluck CMS through 4.7.21 restricts dangerous file uploads in its admin file-management feature using a fixed blacklist in data/inc/files.php ('.php','php3','php4','php5','php6','php7','phtml','.phtm','.pht','.ph3','.ph4','.ph5','.asp','.cgi','.phar'), checked against the last 4-5 characters of the filename.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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
Vulnerability Title
Pluck CMS 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pluck-cms Pluck CMS是Pluck-cms团队的一款轻量级内容管理系统。 Pluck CMS 4.7.21及之前版本存在任意文件上传漏洞，该漏洞源于文件上传功能使用固定黑名单但遗漏了.php8扩展名，可能导致经过身份验证的管理员上传shell.php8文件，在PHP 8.x服务器上被当作PHP执行，从而实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pluck-cms Pluck CMS 0 ~ 4.7.21 -

II. Public POCs for CVE-2026-54416

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7155 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-54416

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Other References for CVE-2026-54416 (1)

IV. Related Vulnerabilities

Same product: Pluck CMS
Same vendor: pluck-cms
Same weakness: CWE-434