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.
References6
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/incl…
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/incl…
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/incl…
- plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/F…
- plugins.trac.wordpress.org/changeset?reponame=&new=3705719%40ni…
- www.wordfence.com/threat-intel/vulnerabilities/id/c599a562-5218…
Metrics
- CVSS 3.1
-
7.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 1% percentile: 50 · as of 8 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.