CVE-2026-94504: Ninja Forms – The Contact Form Builder That Grows With You <= 3.15.3 - Stored Cross-Site Scripting

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-22 · updated 2026-09-22
Weakness: CWE-79

Description

Ninja Forms 3.15.3 stores an anonymous non-RTE textarea value and renders it without safe HTML encoding in the legacy submission editor. An attacker can break out of the textarea with stored script. When an Administrator opens the attacker-known direct submission URL, the script runs in the WordPress admin origin.

Affected products

kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder: through 3.15.3

References

https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Database/Models/Submission.php#L205
https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Fields/Textarea.php#L35
https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Templates/admin-metabox-sub-fields.html.php#L23
https://plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/Fields/Textarea.php#L35
https://plugins.trac.wordpress.org/changeset?reponame=&new=3705719%40ninja-forms%2Ftags%2F3.15.4&old=3685242%40ninja-forms%2Ftags%2F3.15.3
https://www.wordfence.com/threat-intel/vulnerabilities/id/c599a562-5218-4b37-bcf7-0e82008a4e68?source=cve

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