Medium (6.1) in sir gnuboard. 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 "mobile board title contents" parameter, aka the adm/board_form_update.php bo_mobile_subject parameter.
Severity
CVSS 3.0
6.1 medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)