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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
kstover:ninja forms – contact form builder with calculators, quizzes, signatures & ai form builder
References 6
https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Dat…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Fie…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Tem…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/Fields/Te…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&new=3705719%40ninja-form…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/c599a562-5218-4b37-bc…
security@wordfence.com