WordPress plugin "Ninja Forms" vulnerable to PHP object injection


WordPress plugin "Ninja Forms" contains a PHP object injection vulnerability due to a flaw where untrusted POST values are unserialized.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 5.6 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: Low
CVSS V2 Severity:
Base Metrics 6.8 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

WP Ninjas, LLC.
  • Ninja Forms Version 2.9.36 to 2.9.42


A remote attacker may execute an arbitrary PHP code.

[Update the Software]
Update to a version that addresses the vulnerability according to the information provided by the developer.

The developer states that versions 2.9.43 and .1 versions of 2.9.36 through 2.9.42 address this vulnerability (e.g.,, etc.).
Also, the developer suggests updating to version 2.9.45, which contains fixes for other vulnerabilities.
Vendor Information

WP Ninjas, LLC.
CWE (What is CWE?)

  1. Improper Input Validation(CWE-20) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-1209

  1. JVN : JVN#44657371
  2. National Vulnerability Database (NVD) : CVE-2016-1209
  3. Related Information : Ninja Forms <= 2.9.42 Multiple Critical Security Vulnerabilities
Revision History

  • [2016/05/13]
      Web page was published
      Overview : Credit was deleted
      References : Content was added