What’s Vulnerable › Vulnerabilities

CVE-2017-16798

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-11-12 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• CMS Made Simple: 2.2.3.1

References

• https://github.com/bsmali4/cve/blob/master/CMS%20Made%20Simple%20UPLOAD%20FILE%20XSS.md
• https://github.com/bsmali4/cve/blob/master/CMS%20Made%20Simple%20UPLOAD%20FILE%20XSS.md

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