CVE-2026-3610
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Lifecycle Timeline
2Description
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."
Analysis
Reflected cross-site scripting in HSC Cybersecurity Mailinspector through version 5.3.2-3 allows remote attackers to inject malicious scripts via the error_description parameter in the URL handler component. Public exploit code exists for this vulnerability, which could enable attackers to steal session cookies or perform actions on behalf of authenticated users. …
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Remediation
Within 30 days: Identify affected systems running HSC Cybersecurity Mailinspector and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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