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CVE-2026-53599— Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers

Quick assessment

Affected
redaxo core
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.

REDAXO是REDAXO组织开源的一个内容管理系统。 REDAXO 5.18.2版本至5.21.1之前版本存在任意文件上传漏洞，该漏洞源于redaxo/src/addons/mediapool/lib/mediapool.php中的rex_mediapool::isAllowedExtension函数对上传文件类型验证不严，具有media[upload]权限的已认证后台用户可上传名为shell.php.any.jpg的JPEG/PHP混合文件，并被支持多扩展名PHP处理程序的Web服务器以Web服务器用

CVSS 7.5 · High EPSS 0.40% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
redaxo core >= 5.18.2, < 5.21.1 affected
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I. Basic Information for CVE-2026-53599

Vulnerability Information
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Vulnerability Title
Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers
Source: CVE Program / CVE List V5
Vulnerability Description
REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAllowedExtension in redaxo/src/addons/mediapool/lib/mediapool.php lets an authenticated backend user with media[upload] permission upload a JPEG/PHP polyglot named shell.php.any.jpg, which web servers with multi-extension PHP handlers can execute as the web-server user. This issue is fixed in version 5.21.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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
REDAXO 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
REDAXO是REDAXO组织开源的一个内容管理系统。 REDAXO 5.18.2版本至5.21.1之前版本存在任意文件上传漏洞，该漏洞源于redaxo/src/addons/mediapool/lib/mediapool.php中的rex_mediapool::isAllowedExtension函数对上传文件类型验证不严，具有media[upload]权限的已认证后台用户可上传名为shell.php.any.jpg的JPEG/PHP混合文件，并被支持多扩展名PHP处理程序的Web服务器以Web服务器用
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
redaxo core >= 5.18.2, < 5.21.1 -

II. Public POCs for CVE-2026-53599

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 14164 chars
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III. Intelligence Information for CVE-2026-53599

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Patches & Fixes for CVE-2026-53599 (2)

Vendor Advisories for CVE-2026-53599 (1)

Vendor Pages for CVE-2026-53599 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: redaxo
Same weakness: CWE-434

V. Comments for CVE-2026-53599

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