CVE-2019-16759: vBulletin PHP Module Remote Code Execution Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 99.7% chance of exploitation in the next 30 days.

vBulletin 5.x through 5.5.4 allows remote command execution via the widgetConfig[code] parameter in an ajax/render/widget_php routestring request.

Affected products

• vBulletin vBulletin: from 5.0.0, up to and including 5.5.4

Published 2019-09-24. Last modified 2026-06-17.