CVE-2026-3395
MaxSite CMS MarkItUp Preview AJAX Endpoint preview-ajax.php eval code injection
- Published
- Mar 1, 2026
- Updated
- Mar 2, 2026
- Assigning CNA
- VulDB
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 89.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
2Proof-of-concept exploit for unauthenticated remote code execution in MaxSite CMS <= 109.1 via MarkItUp editor AJAX endpoints, with detection and reverse shell payloads.
- CVE-2026-3395-LabResearch
Educational Docker lab demonstrating CVE-2026-3395, an unauthenticated RCE in MaxSite CMS via the run_php plugin, with vulnerable and patched environments for safe reproduction and analysis.
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