In MyBB before 1.8.11, the smilie module allows Directory Traversal via the pathfolder parameter.
https://blog.mybb.com/2017/04/04/mybb-1-8-11-merge-system-1-8-11-release/
http://www.securityfocus.com/bid/98045
http://seclists.org/fulldisclosure/2017/Apr/55
Source: Mitre, NVD
Published: 2017-04-24
Updated: 2019-03-19
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N