What is CVE-2023-53921?

CVE-2023-53921 is a critical-severity vulnerability in Sitemagic Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2025-12-17.

How severe is CVE-2023-53921?

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

Arbitrary file upload in Sitemagic Cms

CVE-2023-53921

SitemagicCMS 4.4.3 contains a remote code execution vulnerability that allows attackers to upload malicious PHP files to the files/images directory. Attackers can upload a .phar file with system command execution payload to compromise the web application and execute arbitrary system commands.

Vulnerability class: Unrestricted File Upload

EPSS: 0.008 (54.1th 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

Sitemagic Sitemagic_cms — versions 4.4.3
Sitemagic Sitemagiccms — versions 4.4.3

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 (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2023-53921?: CVE-2023-53921 is a critical-severity vulnerability in Sitemagic Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2025-12-17.
How severe is CVE-2023-53921?: Critical severity. CVSS v3 base score is 9.8 out of 10.