CVE-2017-16798

Name: CVE-2017-16798
Creator: NVD / NIST
Published: 2017-11-12T18:29:00.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2017-16798 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.86%

53.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Cmsmadesimple	Cms Made Simple	2.2.3.1

References

https://github.com/bsmali4/cve/blob/master/CMS%20Made%20Simple%20UPLOAD%20FILE%20XSS.mdIssue Tracking, Third Party Advisory
https://github.com/bsmali4/cve/blob/master/CMS%20Made%20Simple%20UPLOAD%20FILE%20XSS.mdIssue Tracking, Third Party Advisory

Timeline

Published: Nov 12, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-16798?

How severe is CVE-2017-16798?

CVE-2017-16798 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2017-16798?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-16798?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST