CVE-2018-18670: Sir Gnuboard

Medium severity, CVSS 6.1. EPSS: 1.5% chance of exploitation in the next 30 days.

GNUBOARD5 5.3.1.9 has XSS that allows remote attackers to inject arbitrary web script or HTML via the "Extra Contents" parameter, aka the adm/config_form_update.php cf_1~10 parameter.

Affected products

• Sir Gnuboard: version 5.3.1.9 only

Published 2019-07-23. Last modified 2026-06-17.