An issue was discovered in CMS Made Simple 2.2.8. It is possible to achieve unauthenticated path traversal in the CGExtensions module (in the file action.setdefaulttemplate.php) with the m1_filename parameter; and through the action.showmessage.php file, it is possible to read arbitrary file content (by using that path traversal with m1_prefname set to cg_errormsg and m1_resettodefault=1).
Severity
CVSS 3.1
7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)