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CVE-2026-3395— MaxSite CMS MarkItUp Preview AJAX Endpoint preview-ajax.php eval code injection

Quick assessment

Affected
MaxSite 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.

MaxSite CMS是俄国MaxSite CMS开源的一款网站内容管理系统。 MaxSite CMS 109.1及之前版本存在代码注入漏洞，该漏洞源于组件MarkItUp Preview AJAX Endpoint中文件application/maxsite/admin/plugins/editor_markitup/preview-ajax.php的函数存在代码注入。

CVSS 7.3 · High EPSS 2.47% · P84

Public Exploits 1

Nuclei · 1 CVE-2026-3395.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3395

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
MaxSite CMS MarkItUp Preview AJAX Endpoint preview-ajax.php eval code injection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in MaxSite CMS up to 109.1. This impacts the function eval of the file application/maxsite/admin/plugins/editor_markitup/preview-ajax.php of the component MarkItUp Preview AJAX Endpoint. Executing a manipulation can lead to code injection. It is possible to launch the attack remotely. The exploit has been published and may be used. Upgrading to version 109.2 will fix this issue. This patch is called 08937a3c5d672a242d68f53e9fccf8a748820ef3. You should upgrade the affected component. The code maintainer was informed beforehand about the issues. He reacted very fast and highly professional.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
MaxSite CMS 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MaxSite CMS是俄国MaxSite CMS开源的一款网站内容管理系统。 MaxSite CMS 109.1及之前版本存在代码注入漏洞，该漏洞源于组件MarkItUp Preview AJAX Endpoint中文件application/maxsite/admin/plugins/editor_markitup/preview-ajax.php的函数存在代码注入。
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
MaxSite CMS 109.0 -

II. Public POCs for CVE-2026-3395

# POC Description Source Link Shenlong Link
1 MaxSite CMS through 109.1 allows unauthenticated remote attackers to execute arbitrary code via the MarkItUp editor preview AJAX endpoint, preview-ajax.php. The endpoint insufficiently authenticates the request, failing to ensure the user is logged in, and processes the attacker's input via unsafe usage of PHP eval() on user-supplied [php]...[/php] shortcodes. By providing a POST request to the vulnerable /ajax/ endpoint with crafted input, attackers may achieve remote code execution. The issue is addressed in version 109.2 by implementing proper authentication controls. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-3395.yaml POC Details
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III. Intelligence Information for CVE-2026-3395

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Vendor Advisories for CVE-2026-3395 (1)

IV. Related Vulnerabilities

Same product: CMS
Same vendor: MaxSite
Same weakness: CWE-94

V. Comments for CVE-2026-3395

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