CVE-2017-16798

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CVSS 3.1

5.4 medium

EPSS

<1%p56

Published

Nov 12, 2017 (Nov 12, 2017)

Modified

Jun 17, 2026

Description

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.

Vendors: cmsmadesimple
Products: cms made simple
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.9%)

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