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High

Ninja Forms <= 3.11.0 - Unauthenticated PHP Object Injection

  • Disclosed: 28.08.2025
  • Updated: 11.10.2026 10:22

The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.11.0 via deserialization of untrusted input. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.

Affected software

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PlatformPackageVulnerable versionsFixed in
WordPress plugin Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder <= 3.11.0 3.11.1

References

CVSS score 8.1/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-502
Platform
WordPress
Package
Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder
Disclosed
28.08.2025
Updated
11.10.2026 10:22

Sources and licenses

Wordfence Intelligence - a567b932-7984-400b-bca0-8d2b0e4b1cb7 - Wordfence Intelligence

Copyright 1999-2026 The MITRE Corporation

Copyright 2012-2026 Defiant Inc.

This record contains material that is subject to copyright

Copyright 1999-2026 The MITRE Corporation

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Copyright 2012-2026 Defiant Inc.

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc.
Copyright Defiant, Inc. All rights reserved except as granted below.
License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026):

Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy.

Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/

Vulnerability history: Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (88) in the archive
Total entries
88
First → latest
11.2014 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 3
  • High 26
  • Medium 58
  • Low 1

Disclosures per year

earlier: 11

Severity:
  1. Ninja Forms <= 3.15.4 - Unauthenticated Stored Cross-Site Scripting via Paragraph Text (RTE) Field Submission
    High · 7.2 CVE-2026-90438 <= 3.15.4 3.15.5
  2. Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder <= 3.15.3 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-102385 <= 3.15.3 3.15.5
  3. Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder <= 3.15.3 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-95515 <= 3.15.3 3.15.4
  4. Ninja Forms <= 3.15.3 - Unauthenticated PHP Object Injection
    High · 8.1 CVE-2026-91827 <= 3.15.3 3.15.4
  5. Ninja Forms <= 3.15.3 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-92438 <= 3.15.3 3.15.4
  6. Ninja Forms – The Contact Form Builder That Grows With You <= 3.15.3 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-94504 <= 3.15.3 3.15.4
  7. Ninja Forms <= 3.15.1 - Unauthenticated Stored Cross-Site Scripting via Repeater Child 'type' Confusion via Unmatched Array Key
    High · 7.2 CVE-2026-19769 <= 3.15.1 3.15.2
  8. Ninja Forms <= 3.14.1 - Missing Authorization to Unauthenticated Sensitive Information Disclosure via token/refresh REST Endpoint
    High · 7.5 CVE-2026-1239 <= 3.14.1 3.14.2
  9. Ninja Forms <= 3.14.0 - Unauthenticated Information Disclosure in nf_ajax_submit AJAX Action
    High · 7.5 CVE-2026-2268 <= 3.14.0 3.14.1
  10. Ninja Forms – The Contact Form Builder That Grows With You <= 3.13.2 - Insecure Direct Object Reference to Unauthenticated Sensitive Information Exposure via Unscoped Bearer Token
    High · 7.5 CVE-2025-11924 <= 3.13.2 3.13.3
  11. Ninja Forms <= 3.13.2 - Missing Authorization to Unauthenticated Submission Disclosure
    High · 7.5 CVE-2025-14072 <= 3.13.2 3.13.3
  12. Ninja Forms <= 3.11.0 - Unauthenticated PHP Object Injection this entry
    High · 8.1 CVE-2025-9083 <= 3.11.0 3.11.1
  13. Ninja Forms – The Contact Form Builder That Grows With You <= 3.8.19 - Unauthenticated Stored Cross-Site Scripting via Form Calculations
    High · 7.2 CVE-2024-11052 <= 3.8.19 3.8.20
  14. Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress <= 3.6.12 - Authenticated (Administrator+) PHP Objection Injection
    High · 7.2 CVE-2022-2903 <= 3.6.12 3.6.13
  15. Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress <= 3.6.10 - Code Injection
    Critical · 9.8 df46b3d5-a433-47b5-99b8-117591f7dd16 <= 3.0.34.1, >= 3.1, <= 3.1.9, >= 3.2, <= 3.2.27, >= 3.3, <= 3.3.21.3, >= 3.4, <= 3.4.34.1, >= 3.5, <= 3.5.8.3, >= 3.6, <= 3.6.10 3.0.34.2, 3.1.10, 3.2.28, 3.3.21.4, 3.4.34.2, 3.5.8.4, 3.6.11
  16. Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress <= 3.6.9 - Cross-Site Request Forgery to Field Import and PHP Object Injection
    High · 8.8 488970f0-3120-4f4a-9915-2ae1708bd86a <= 3.6.9 3.6.10
  17. Ninja Forms Contact Form <= 3.6.3 - Authenticated SQL Injection
    High · 7.2 CVE-2021-24889 < 3.6.4 3.6.4
  18. Ninja Forms Contact Form <= 3.4.33 - Authenticated SendWP Plugin Installation and Client Secret Key Disclosure
    High · 8.8 CVE-2021-24163 < 3.4.34 3.4.34
  19. Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress <= 3.4.27 - Cross-Site Request Forgery to Plugin Installation
    High · 8.8 CVE-2020-36174 <= 3.4.27 3.4.27.1
  20. Ninja Forms Contact Form <= 3.3.21.1 - SQL Injection
    Critical · 9.8 CVE-2019-15025 <= 3.3.21.1 3.3.21.2
  21. Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress <= 3.3.13 - Cross-Site Scripting
    High · 8.3 aa735320-f7fe-4e51-9f9a-f4c8f3ddc2e7 < 3.3.14 3.3.14
  22. Ninja Forms Contact Form <= 3.3.13 - CSV Injection
    High · 8.6 CVE-2018-16308 <= 3.3.13 3.3.14
  23. Ninja Forms <= 3.3.8 - Insufficient Restrictions during Export Personal Data requests
    Critical · 9.1 CVE-2018-20981 <= 3.3.8 3.3.9
  24. Ninja Forms Contact Form <= 3.2.14 - Parameter Tampering
    High · 7.5 CVE-2018-20980 < 3.2.15 3.2.15
  25. Ninja Forms Contact Form <= 2.9.55.1 - Authenticated SQL Injection
    High · 8.8 89a44d42-a110-4f55-ad27-2be4ccb41a16 < 2.9.55.2 2.9.55.2
  26. Ninja Forms Contact Form 2.9.36 - 2.9.42 - PHP Object Injection
    High · 8.1 CVE-2016-1209 >= 2.9.36, <= 2.9.42 2.9.42.1
  27. Ninja Forms Contact Form <= 2.9.28 - Stored Cross-Site Scripting
    High · 7.2 7bd89bd9-4f99-4828-bacc-15d2cfe13066 <= 2.9.28 2.9.29
  28. Ninja Forms Contact Form <= 2.9.27 - CSV Injection
    High · 8.4 39b6a1c7-2f8a-49e9-8807-a53a25524018 <= 2.9.27 2.9.28
  29. Ninja Forms Contact Form <= 2.8.8 - Stored Cross-Site Scripting
    High · 7.2 CVE-2015-2220 < 2.8.9 2.8.9

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