CVE-2019-11454: Canonical Ubuntu Linux

Medium severity, CVSS 6.1. EPSS: 2.4% chance of exploitation in the next 30 days.

Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unauthenticated attacker to introduce arbitrary JavaScript via manipulation of an unsanitized user field of the Authorization header for HTTP Basic Authentication, which is mishandled during an _viewlog operation.

Affected products

• Canonical Ubuntu Linux: version 18.10 only; version 19.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• Mmonit Monit: before 5.25.3 (fixed in 5.25.3)

Published 2019-04-22. Last modified 2026-06-17.