CVE-2026-29964: Hsclabs Mailinspector

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

HSC MailInspector v5.3.3-7 contains a Cross-Site Scripting (XSS) vulnerability in the /tap/tap.php endpoint due to improper neutralization of user-controlled input using alternate or obfuscated JavaScript syntax. The endpoint reflects unsanitized user input in HTTP responses without adequate output encoding, allowing a remote attacker to execute arbitrary JavaScript code in the context of a victim's browser.

Affected products

• Hsclabs Mailinspector: version 5.3.3-7 only

Published 2026-05-18. Last modified 2026-06-17.