HSC Cybersecurity Mailinspector: Remote Code Injection via Malicious Input

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5.3

HSC Cybersecurity Mailinspector: Remote Code Injection via Malicious Input

CVE-2026-3610

Summary

A vulnerability in HSC Cybersecurity Mailinspector's user validation feature allows an attacker to inject malicious code into the system. This could potentially allow an attacker to take control of the system or steal sensitive information. To fix this issue, update to version 5.4.0 or apply the vendor's hotfix, which is available to affected customers, to prevent remote code injection attacks.

Original title

Original description

A vulnerability was found in HSC Cybersecurity Mailinspector up to 5.3.2-3. Affected by this issue is some unknown functionality of the file /mailinspector/mliUserValidation.php of the component URL Handler. The manipulation of the argument error_description results in cross site scripting. The attack may be performed from remote. The exploit has been made public and could be used. Upgrading to version 5.4.0 can resolve this issue. You should upgrade the affected component. The vendor was contacted early and responded very professional: "We have already implemented the fix and made a hotfix available to affected customers, ensuring mitigation while the official release 5.4.0 has not yet been published. This allows customers to address the issue immediately, outside the regular release cycle."

nvd CVSS2.0 5.0

nvd CVSS3.1 4.3

nvd CVSS4.0 5.3

Vulnerability type

CWE-79 Cross-site Scripting (XSS)

CWE-94 Code Injection

Published: 6 Mar 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026