CVE-2019-18378: Symantec Messaging Gateway

Medium severity, CVSS 4.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Symantec Messaging Gateway, prior to 10.7.3, may be susceptible to a cross-site scripting (XSS) exploit, which is a type of issue that can enable attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to potentially bypass access controls such as the same-origin policy.

Affected products

• Symantec Messaging Gateway: before 10.7.3 (fixed in 10.7.3)

Published 2019-12-11. Last modified 2026-06-17.