What is CVE-2023-4109?

CVE-2023-4109 is a medium-severity vulnerability in Ninjaforms Ninja Forms Contact Form, classified under CWE-80 IMPROPER NEUTRALIZATION OF SCRIPT-RELATED HTML TAGS IN A WEB PAGE (BASIC XSS). CVSS score: 4.8/10. Published 2023-08-30.

How severe is CVE-2023-4109?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Is CVE-2023-4109 known to be exploited?

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

Vulnerability in Ninjaforms Ninja Forms Contact Form

CVE-2023-4109

The Ninja Forms WordPress Ninja Forms Contact Form WordPress plugin before 3.6.26 was affected by a HTML Injection security vulnerability.

Published 2023-08-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Ninjaforms Ninja Forms Contact Form
Ninja Forms Contact Form — versions 0

Public proof-of-concept exploits

References

wpscan.com/vulnerability/558e06ab-704b-4bb1-ba7f-b5f6bbbd68d9 (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2023-4109?: CVE-2023-4109 is a medium-severity vulnerability in Ninjaforms Ninja Forms Contact Form, classified under CWE-80 IMPROPER NEUTRALIZATION OF SCRIPT-RELATED HTML TAGS IN A WEB PAGE (BASIC XSS). CVSS score: 4.8/10. Published 2023-08-30.
How severe is CVE-2023-4109?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2023-4109 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.