CVE-2018-19420

3.8 lowEPSS 0.8%

Low (3.8) in get-simple getsimple cms. EPSS 0.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.0

3.8 low

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE: CWE-434
Published: 2018-11-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

get-simple:getsimple_cms

References

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

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