What is CVE-2021-40188?

CVE-2021-40188 is a high-severity vulnerability in Php-Fusion Phpfusion, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2021-10-11.

How severe is CVE-2021-40188?

High severity. CVSS v3 base score is 7.2 out of 10.

Arbitrary file upload in Php-Fusion Phpfusion

CVE-2021-40188

PHPFusion 9.03.110 is affected by an arbitrary file upload vulnerability. The File Manager function in admin panel does not filter all PHP extensions such as ".php, .php7, .phtml, .php5, ...". An attacker can upload a malicious file and execute code on the server.

Vulnerability class: Unrestricted File Upload

Published 2021-10-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Php-Fusion Phpfusion — versions 9.03.110

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

github.com/PHPFusion/PHPFusion/issues/2372 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40188?: CVE-2021-40188 is a high-severity vulnerability in Php-Fusion Phpfusion, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2021-10-11.
How severe is CVE-2021-40188?: High severity. CVSS v3 base score is 7.2 out of 10.