HIGH
vBulletin 5.x through 5.5.4 allows remote command execution via the widgetConfig[code] parameter in an ajax/render/widget_php routestring request.
http://packetstormsecurity.com/files/154648/vBulletin-5.x-Pre-Auth-Remote-Code-Execution.html
http://packetstormsecurity.com/files/155633/vBulletin-5.5.4-Remote-Command-Execution.html
http://packetstormsecurity.com/files/158829/vBulletin-5.x-Remote-Code-Execution.html
http://packetstormsecurity.com/files/158830/vBulletin-5.x-Remote-Code-Execution.html
http://packetstormsecurity.com/files/158866/vBulletin-5.x-Remote-Code-Execution.html
http://seclists.org/fulldisclosure/2020/Aug/5
https://seclists.org/fulldisclosure/2019/Sep/31
https://www.theregister.co.uk/2019/09/24/vbulletin_vbug_zeroday/
Source: MITRE
Published: 2019-09-24
Updated: 2020-08-19
Type: CWE-20
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL