CVE-2024-3866: The Ninja Forms Contact Form plugin for WordPress is vulnerable to Reflected Self-Based Cross-Site Scripting via the 'Referer' header in all versions up to, and including, 3.8.15 due to insufficient i

medium Affects ninja-forms (WordPress plugin). Feed 2026.10.29.3, updated 2026-10-29; published ; advisory modified .

The Ninja Forms Contact Form plugin for WordPress is vulnerable to Reflected Self-Based Cross-Site Scripting via the 'Referer' header in all versions up to, and including, 3.8.15 due to insufficient i

Package
ninja-forms (WordPress plugin) WordPress
Affected versions
<3.8.16
Fixed in
3.8.16
Severity
medium  CVSS 4.7
Exploitation
not on CISA KEV · EPSS 0% (21.6th percentile)
Published
2024-09-25
Source
nvd

References

CWE-79
NVD recordninja-forms (WordPress plugin) advisories

Am I affected?

Find out in one command. phpwarden checks your WordPress install against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden wordpress /var/www/html

# or, without Composer
pipx install phpwarden   &&   phpwarden wordpress /var/www/html

Or keep it checked automatically with the GitHub Action or a nightly cron; see WordPress docs.

Install docs   How findings are ranked

Related advisories