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

What is CVE-2026-3395?

CVE-2026-3395 is a medium-severity vulnerability in MaxSite CMS, published on 1 Mar 2026.

Official 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.

Weakness: CWE-94, CWE-74

Which versions are affected by CVE-2026-3395?

It affects 1 product.

Products include Max-3000 Maxsite Cms.

How do I fix CVE-2026-3395?

No fix has been published for CVE-2026-3395 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-3395 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3395 exists.

Public exploit code: 1 Nuclei template and 2 proofs of concept on GitHub.

Other vulnerabilities in MaxSite CMS

• CVE-2022-25411 File upload in n/a Critical 9.8
• CVE-2021-27983 Code injection in n/a Critical 9.8
• CVE-2022-25412 Path traversal in n/a High 8.1
• CVE-2022-25410 Cross-site scripting in n/a Medium 5.4
• CVE-2022-25413 Cross-site scripting in n/a Medium 5.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-g6fv-7p3q-j4fc.