Cross-Site Scripting in Ninja Forms Success Message Action

Ninja Forms before 3.14.1 output the Success Message action without HTML sanitisation and did not escape merge-tag values (such as submitted field values) inserted into it. An attacker can submit form input containing script markup that is rendered in the browser when the success message is displayed. The fix sanitises the message with wp_kses_post() and escapes merge-tag values in success messages.

This vulnerability affects the following application versions:

• Ninja Forms – The Contact Form Builder 3.6.34
• Ninja Forms – The Contact Form Builder 3.6.34.1
• Ninja Forms – The Contact Form Builder 3.7.3
• Ninja Forms – The Contact Form Builder 3.7.3.1
• Ninja Forms – The Contact Form Builder 3.8.0
• Ninja Forms – The Contact Form Builder 3.8.1
• Ninja Forms – The Contact Form Builder 3.8.2
• Ninja Forms – The Contact Form Builder 3.8.3
• Ninja Forms – The Contact Form Builder 3.8.4
• Ninja Forms – The Contact Form Builder 3.8.5
• Ninja Forms – The Contact Form Builder 3.8.6
• Ninja Forms – The Contact Form Builder 3.8.7
• Ninja Forms – The Contact Form Builder 3.8.8
• Ninja Forms – The Contact Form Builder 3.8.9
• Ninja Forms – The Contact Form Builder 3.8.10
• Ninja Forms – The Contact Form Builder 3.8.11
• Ninja Forms – The Contact Form Builder 3.8.12
• Ninja Forms – The Contact Form Builder 3.8.13
• Ninja Forms – The Contact Form Builder 3.8.14
• Ninja Forms – The Contact Form Builder 3.8.15
• Ninja Forms – The Contact Form Builder 3.8.16
• Ninja Forms – The Contact Form Builder 3.8.17
• Ninja Forms – The Contact Form Builder 3.8.18
• Ninja Forms – The Contact Form Builder 3.8.19
• Ninja Forms – The Contact Form Builder 3.8.20
• Ninja Forms – The Contact Form Builder 3.8.21
• Ninja Forms – The Contact Form Builder 3.8.22
• Ninja Forms – The Contact Form Builder 3.8.23
• Ninja Forms – The Contact Form Builder 3.8.24
• Ninja Forms – The Contact Form Builder 3.8.25
• Ninja Forms – The Contact Form Builder 3.8.25.1
• Ninja Forms – The Contact Form Builder 3.9.0
• Ninja Forms – The Contact Form Builder 3.9.1
• Ninja Forms – The Contact Form Builder 3.9.2
• Ninja Forms – The Contact Form Builder 3.9.2.1
• Ninja Forms – The Contact Form Builder 3.10.0
• Ninja Forms – The Contact Form Builder 3.10.1
• Ninja Forms – The Contact Form Builder 3.10.2
• Ninja Forms – The Contact Form Builder 3.10.2.1
• Ninja Forms – The Contact Form Builder 3.10.2.2
• Ninja Forms – The Contact Form Builder 3.10.3
• Ninja Forms – The Contact Form Builder 3.10.4
• Ninja Forms – The Contact Form Builder 3.10.4.1
• Ninja Forms – The Contact Form Builder 3.11.0
• Ninja Forms – The Contact Form Builder 3.11.1
• Ninja Forms – The Contact Form Builder 3.11.1.1
• Ninja Forms – The Contact Form Builder 3.12.0
• Ninja Forms – The Contact Form Builder 3.12.1
• Ninja Forms – The Contact Form Builder 3.12.2
• Ninja Forms – The Contact Form Builder 3.12.2.1
• Ninja Forms – The Contact Form Builder 3.13.0
• Ninja Forms – The Contact Form Builder 3.13.1
• Ninja Forms – The Contact Form Builder 3.13.2
• Ninja Forms – The Contact Form Builder 3.13.3
• Ninja Forms – The Contact Form Builder 3.13.4
• Ninja Forms – The Contact Form Builder 3.14.0