---
id: CVE-2026-100155
title: >-
  Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via
  'formData' Field Value via Success Message Merge Tag
summary: >-
  The The Ninja Forms – Contact Form Builder with Calculators, Quizzes,
  Signatures & AI Form Builder plugin for WordPress is vulnerable to arbitrary
  shortcode execution in all versions up to, and including, 3.15.5 This is due
  to the softwa…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-94
vendor: kstover
product: >-
  Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI
  Form Builder
affected:
  - >-
    ninja_forms_contact_form_builder_with_calculators_quizzes_signatures_ai_form_builder
    <= 3.15.5
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-02T14:50:33.517770Z'
published: '2026-10-31'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T14:50:42.803Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-100155'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/a1cf42f7-77c6-4594-a6a4-cebf5c3558d7?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Actions/SuccessMessage.php#L63
  - url: >-
      https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Actions/SuccessMessage.php#L70
  - url: >-
      https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/AJAX/Controllers/Submission.php#L52
  - url: >-
      https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Abstracts/MergeTags.php#L64
  - url: >-
      https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/MergeTags/Fields.php#L268
  - url: >-
      https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/AJAX/Controllers/Submission.php#L60
  - url: 'https://wordpress.org/plugins/ninja-forms/'
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&new=3749135%40ninja-forms%2Ftags%2F3.15.6&old=3717122%40ninja-forms%2Ftags%2F3.15.5
tags:
  - cve.org
epss: 0.00514
epssPercentile: 0.43939
ingestedAt: '2026-11-05T19:30:42.672Z'
---

## Overview

The The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 3.15.5 This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.

## Affected

- `ninja_forms_contact_form_builder_with_calculators_quizzes_signatures_ai_form_builder <= 3.15.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.