CVE-2021-47753

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

phpKF CMS 3.00 Beta y6 contains an unauthenticated file upload vulnerability that allows remote attackers to execute arbitrary code by bypassing file extension checks. Attackers can upload a PHP file disguised as a PNG, rename it, and execute system commands through a crafted web shell parameter.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-434

Affected software

VendorProductVersions
PhpkfphpKF CMS3.00

References

Timeline

Published
Jan 15, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2021-47753: Critical severity, CVSS 9.8 | Vulnix