Arbitrary Shortcode Execution in Ninja Forms Plugin for WordPress
CVE-2026-100155

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
Ninja Forms – Contact Form Builder With Calculators, Quizzes, Signatures & Ai Form Builder
Vendor
CVE Published:
31 October 2026

What is CVE-2026-100155?

The Ninja Forms plugin for WordPress is vulnerable to arbitrary shortcode execution due to insufficient validation of user-executed actions. This flaw permits unauthorized users to execute arbitrary shortcodes, potentially exposing the website to various security risks. The vulnerability affects all versions of the plugin up to and including 3.15.5, allowing attackers to exploit the weakness without authentication.

Affected Version(s)

Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder 0 <= 3.15.5

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/ninja-forms/ta...
https://plugins.trac.wordpress.org/browser/ninja-forms/ta...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kuba
.