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CVE-2026-6261— Betheme <= 28.4 - Authenticated (Author+) Arbitrary File Upload to Remote Code Execution via Icon Pack Upload

Quick assessment

Affected
MuffinGroup Betheme
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和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Betheme 28.4及之前版本存在代码问题漏洞，该漏洞源于upload_icons()函数工作流将用户控制的ZIP文件移动并解压到公共上传目录而未验证提取的文件类型，可能导致任意文件上传和远程代码执行。

CVSS 8.8 · High EPSS 0.79% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
MuffinGroup Betheme ≤ 28.4 affected
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I. Basic Information for CVE-2026-6261

Vulnerability Information
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Vulnerability Title
Betheme <= 28.4 - Authenticated (Author+) Arbitrary File Upload to Remote Code Execution via Icon Pack Upload
Source: CVE Program / CVE List V5
Vulnerability Description
The Betheme theme for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 28.4. This is due to the upload_icons() function workflow moving and unzipping user-controlled ZIP files into a public uploads directory without validating extracted file types. This makes it possible for authenticated attackers, with author-level access and above, to upload arbitrary files (including PHP) and achieve remote code execution via the Icons icon-pack upload flow.
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
Vulnerability Title
WordPress plugin Betheme 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Betheme 28.4及之前版本存在代码问题漏洞，该漏洞源于upload_icons()函数工作流将用户控制的ZIP文件移动并解压到公共上传目录而未验证提取的文件类型，可能导致任意文件上传和远程代码执行。
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
MuffinGroup Betheme 0 ~ 28.4 -

II. Public POCs for CVE-2026-6261

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III. Intelligence Information for CVE-2026-6261

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Vendor Advisories for CVE-2026-6261 (1)

Vendor Pages for CVE-2026-6261 (1)

IV. Related Vulnerabilities

Same product: Betheme
Same vendor: MuffinGroup
Same weakness: CWE-434