What is CVE-2021-47753?

CVE-2021-47753 is a critical-severity vulnerability in Phpkf Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-01-15.

How severe is CVE-2021-47753?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Phpkf Cms

CVE-2021-47753

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 exec…

Vulnerability class: Unrestricted File Upload

EPSS: 0.007 (47.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Phpkf Cms — versions 3.00
Phpkf Cms — versions 3.00

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

disclosure@vulncheck.com (Exploit, Third Party Advisory, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (Product, product)

Frequently asked questions

What is CVE-2021-47753?: CVE-2021-47753 is a critical-severity vulnerability in Phpkf Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-01-15.
How severe is CVE-2021-47753?: Critical severity. CVSS v3 base score is 9.8 out of 10.