Unauthenticated Information Disclosure via Repeater Field Merge Tags in Ninja Forms

Ninja Forms up to and including 3.14.0 resolves merge tags inside user-submitted repeater field values during form submission (nf_ajax_submit). An unauthenticated attacker can submit merge tags such as {post_meta:KEY} to read arbitrary post metadata, including customer billing details, API keys and tokens. The fix stops merge-tag processing on user-submitted repeater values.

This vulnerability affects the following application versions:

• 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