CVE-2026-37503: v2board

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Cross-Site Scripting (XSS) in V2Board thru 1.7.4. The custom_html field in theme configuration is rendered using Blade unescaped output in public/theme/v2board/dashboard.blade.php. An admin can inject arbitrary JavaScript via the saveThemeConfig API. All site visitors execute the payload, enabling cookie theft, session hijacking, or phishing.

Affected products

• v2board v2board: up to and including 1.7.4

Published 2026-05-01. Last modified 2026-06-17.