CVE-2020-17496: vBulletin PHP Module Remote Code Execution Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 87.4% chance of exploitation in the next 30 days.

vBulletin 5.5.4 through 5.6.2 allows remote command execution via crafted subWidgets data in an ajax/render/widget_tabbedcontainer_tab_panel request. NOTE: this issue exists because of an incomplete fix for CVE-2019-16759.

Affected products

• vBulletin vBulletin: from 5.5.4, up to and including 5.6.2

Published 2020-08-12. Last modified 2026-06-17.