CVE-2026-3395
Published: 01 March 2026
Summary
CVE-2026-3395 is a medium-severity Injection (CWE-74) vulnerability in Max-3000 Maxsite Cms. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 38.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-3395 is a code injection vulnerability in MaxSite CMS versions up to and including 109.1, stemming from unsafe usage of the eval() function in the file application/maxsite/admin/plugins/editor_markitup/preview-ajax.php within the MarkItUp Preview AJAX Endpoint component. This flaw, associated with CWE-74 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-94 (Improper Control of Generation of Code), allows arbitrary code execution when malicious input is processed.
Remote attackers can exploit this vulnerability without authentication or user interaction, as indicated by its CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). By sending crafted requests to the affected endpoint, attackers can inject and execute arbitrary code, potentially leading to limited impacts on confidentiality, integrity, and availability.
Mitigation involves upgrading to MaxSite CMS version 109.2, which includes the fixing commit 08937a3c5d672a242d68f53e9fccf8a748820ef3 available on the project's GitHub repository. Advisories from VulDB note that the code maintainer was informed in advance and responded promptly and professionally to address the issue.
An exploit for this vulnerability has been publicly disclosed and may be actively used in the wild.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9130
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated code injection (eval) in public-facing MaxSite CMS web app directly enables T1190 for arbitrary code execution on the server.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of all inputs to the preview-ajax.php endpoint before they reach the unsafe eval() call, blocking the code-injection vector.
Enforces authentication and authorization checks on the MarkItUp Preview AJAX endpoint so unauthenticated remote attackers cannot reach the vulnerable code path.
Mandates timely application of the published patch (commit 08937a3) that removes the unsafe eval() usage in version 109.2.