CVE-2023-51803: Linuxserver Heimdall Application Dashboard

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

LinuxServer.io Heimdall before 2.5.7 does not prevent use of icons that have non-image data such as the "<?php ?>" substring.

Affected products

• Linuxserver Heimdall Application Dashboard: before 2.5.7 (fixed in 2.5.7)

Published 2024-04-01. Last modified 2026-06-17.