What is CVE-2020-17450?

CVE-2020-17450 is a medium-severity vulnerability in Php-Fusion, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-12.

How severe is CVE-2020-17450?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2020-17450 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Php-Fusion

CVE-2020-17450

PHP-Fusion 9.03 allows XSS on the preview page.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-08-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Php-Fusion

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

sec-consult.com/en/blog/advisories/multiple-cross-site-scripting-xss-vulnerabil… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-17450?: CVE-2020-17450 is a medium-severity vulnerability in Php-Fusion, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-12.
How severe is CVE-2020-17450?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-17450 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.