CVE-2026-100155
Received Received - Intake

Arbitrary Shortcode Execution in Ninja Forms WordPress Plugin

Publication date: 2026-10-31

Last updated on: 2026-10-31

Assigner: Wordfence

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.

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Meta Information

Published
2026-10-31
Last Modified
2026-10-31
Generated
2026-10-31
AI Q&A
2026-10-31
EPSS Evaluated
N/A
NVD
CVE-2026-100155
EUVD
EUVD-2026-114578

Affected Vendors & Products

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

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Executive Summary

This vulnerability in the Ninja Forms WordPress plugin allows unauthenticated attackers to execute arbitrary shortcodes due to improper validation of user input before running do_shortcode. The flaw exists in versions up to and including 3.15.5.

Detection Guidance

Check WordPress plugin versions for Ninja Forms. Use commands like 'wp plugin list' in WP-CLI or inspect the plugin directory for version files. Look for versions up to 3.15.5.

Impact Analysis

An attacker could exploit this to perform unauthorized actions on your WordPress site, such as accessing sensitive data, modifying content, or executing malicious code. This could lead to site compromise or data breaches.

Compliance Impact

This vulnerability could lead to unauthorized access or data exposure, which may violate compliance requirements under GDPR or HIPAA. Organizations using affected versions may face legal or regulatory penalties if data is compromised.

Mitigation Strategies

Update the Ninja Forms plugin to the latest version immediately. Disable the plugin if updates are not possible. Monitor for unauthorized shortcode execution in logs.

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