CVE-2026-100155

Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via 'formData' Field Value via Success Message Merge Tag

Published Oct 31, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Kstover
Kstover ninja Forms – Contact Form Builder With Calculators, Quizzes, Signatures & Ai Form Builder
Wordpress-extensions
Wordpress-extensions ninja Forms
Vendors & Products Kstover
Kstover ninja Forms – Contact Form Builder With Calculators, Quizzes, Signatures & Ai Form Builder
Wordpress-extensions
Wordpress-extensions ninja Forms
Type Values Removed Values Added
Description 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.
Title Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via 'formData' Field Value via Success Message Merge Tag
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Wordfence
Published
Updated
Nov 2, 2026, 2:50 PM
Reserved
Sep 25, 2026, 12:17 PM
Status
Deferred
Published
Oct 31, 2026, 6:16 AM
Modified
Nov 2, 2026, 4:19 PM