CVE-2023-53921

Name: CVE-2023-53921
Creator: NVD / NIST
Published: 2025-12-17T23:15:51.107+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2023-53921 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

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

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.81%

52.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Sitemagic	Sitemagic Cms	4.4.3

References

https://sitemagic.org/Download.htmlProduct
https://www.exploit-db.com/exploits/51464Exploit, Third Party Advisory
https://www.vulncheck.com/advisories/sitemagiccms-remote-code-execution-via-unrestricted-file-uploadThird Party Advisory
https://www.exploit-db.com/exploits/51464Exploit, Third Party Advisory

Timeline

Published: Dec 17, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-53921?

How severe is CVE-2023-53921?

CVE-2023-53921 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2023-53921?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-53921?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST