CVE-2017-16798
MEDIUMCMS Made Simple 2.2.3.1 - Cross-Site Scripting via File Upload Extension Bypass
Title source: llmDescription
In CMS Made Simple 2.2.3.1, the is_file_acceptable function in modules/FileManager/action.upload.php only blocks file extensions that begin or end with a "php" substring, which allows remote attackers to bypass intended access restrictions or trigger XSS via other extensions, as demonstrated by .phtml, .pht, .html, or .svg.
References (1)
Core 1
Core References
Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/bsmali4/cve/blob/master/CMS%20Made%20Simple%20UPLOAD%20FILE%20XSS.md
Scores
CVSS v3
5.4
EPSS
0.0050
EPSS Percentile
66.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Details
CWE
CWE-79
Status
published
Products (1)
cmsmadesimple/cms_made_simple
2.2.3.1
Published
Nov 12, 2017
Tracked Since
Feb 18, 2026