What is CVE-2021-28280?

CVE-2021-28280 is a medium-severity vulnerability in Php-Fusion Phpfusion, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-29.

How severe is CVE-2021-28280?

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

XSS in Php-Fusion Phpfusion

CVE-2021-28280

CSRF + Cross-site scripting (XSS) vulnerability in search.php in PHPFusion 9.03.110 allows remote attackers to inject arbitrary web script or HTML

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-29 · 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: 0.007 (51.5th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Php-Fusion Phpfusion — versions 9.03.110

Weakness classification (CWE)

References

anotepad.com/notes/2skndayt (Exploit, Third Party Advisory)
github.com/PHPFusion/PHPFusion/commit/08d6c2ea49bd06fcce32275252f5f25abe61965c (Patch, Third Party Advisory)
github.com/PHPFusion/PHPFusion/commit/fda266c3bb35c650a8c4c51b6923abdfb66ef5cd (Patch, Third Party Advisory)
github.com/PHPFusion/PHPFusion/commit/1c2b32321cf11ed1cd3ff835f8da0d172c849ce6 (Patch, Third Party Advisory)
github.com/PHPFusion/PHPFusion/commit/da9f89ae70219f357fba6fffd2dae1ec886d8a3b (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-28280?: CVE-2021-28280 is a medium-severity vulnerability in Php-Fusion Phpfusion, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-29.
How severe is CVE-2021-28280?: Medium severity. CVSS v3 base score is 6.1 out of 10.