What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-01 · updated 2026-06-17
• Weakness: CWE-74

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.

Affected products

• MaxSite CMS: before 109.2 — fixed in 109.2

How to fix

Upgrade to a fixed version: MaxSite CMS 109.2. Check the vendor advisory for mitigations.

References

• https://github.com/maxsite/cms/
• https://github.com/maxsite/cms/commit/08937a3c5d672a242d68f53e9fccf8a748820ef3
• https://vuldb.com/?ctiid.348281
• https://vuldb.com/?id.348281
• https://vuldb.com/?submit.762169

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