Unauthenticated PHP Object Injection in Integration for Mailchimp

Publication date: 2026-06-15

Last updated on: 2026-06-15

Assigner: Patchstack

Description

Unauthenticated PHP Object Injection in Integration for Mailchimp and Contact Form 7, WPForms, Elementor, Ninja Forms <= 1.1.8 versions.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-15

Last Modified

2026-06-15

Generated

2026-07-06

AI Q&A

2026-06-16

EPSS Evaluated

2026-07-04

NVD

CVE-2026-49765

Affected Vendors & Products

Vendor	Product	Version / Range
mailchimp	integration	to 1.1.8 (inc)
wpforms	wpforms	to 1.1.8 (inc)
elementor	elementor	to 1.1.8 (inc)
ninja_forms	ninja_forms	to 1.1.8 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Executive Summary

This vulnerability is an unauthenticated PHP Object Injection affecting the Integration for Mailchimp and several WordPress plugins including Contact Form 7, WPForms, Elementor, and Ninja Forms in versions up to 1.1.8.

PHP Object Injection occurs when an attacker is able to inject a serialized PHP object into an application without authentication, potentially leading to remote code execution or other malicious actions.

Impact Analysis

This vulnerability has a very high severity with a CVSS score of 9.8, indicating it can be exploited remotely without any privileges or user interaction.

Successful exploitation can lead to complete compromise of the affected system, including full confidentiality, integrity, and availability impacts.

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