class.showtime2_image.php in CMS Made Simple (CMSMS) before 2.2.10 does not ensure that a watermark file has a standard image file extension (GIF, JPG, JPEG, or PNG).
https://www.exploit-db.com/exploits/46627/
https://www.exploit-db.com/exploits/46546/
https://forum.cmsmadesimple.org/viewtopic.php?f=1&t=80285
http://viewsvn.cmsmadesimple.org/diff.php?repname=showtime2&path=%2Ftrunk%2Flib%2Fclass.showtime2_image.php&rev=47
http://packetstormsecurity.com/files/152269/CMS-Made-Simple-CMSMS-Showtime2-File-Upload-Remote-Command-Execution.html
Source: Mitre, NVD
Published: 2019-03-11
Updated: 2026-06-17
Base Score: 4
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N
Severity: Medium
Base Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.45896