What’s Vulnerable › Vulnerabilities

CVE-2018-19420

• Severity: low (CVSS 3.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-11-21 · updated 2026-06-17
• Weakness: CWE-434

Description

In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative cases in which HTML can be executed, such as a file with no extension or an unrecognized extension (e.g., the test or test.asdf filename), because of admin/upload-uploadify.php, and validate_safe_file in admin/inc/security_functions.php.

Affected products

• GetSimple CMS: 3.3.15

References

• https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1301
• https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1301

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