What is CVE-2021-40189?

CVE-2021-40189 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-2021-40189?

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

Arbitrary file upload in Php-Fusion Phpfusion

CVE-2021-40189

PHPFusion 9.03.110 is affected by a remote code execution vulnerability. The theme function will extract a file to "webroot/themes/{Theme Folder], where an attacker can access and execute arbitrary code.

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: 0.018 (77.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · 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/2374 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40189?: CVE-2021-40189 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-2021-40189?: High severity. CVSS v3 base score is 7.2 out of 10.