CVE-2026-105421 in Kit Plugin
Summary
by MITRE • 10/05/2026
Missing Authorization vulnerability in Kit Kit (formerly ConvertKit) for WooCommerce convertkit-for-woocommerce allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Kit (formerly ConvertKit) for WooCommerce: from n/a through 2.2.0.
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Analysis
by VulDB Data Team • 10/05/2026
The identified security flaw resides within the Kit, formerly known as ConvertKit, plugin for WordPress and specifically its integration with the WooCommerce e-commerce platform. This vulnerability is classified under CWE-862, which denotes Missing Authorization, indicating a fundamental failure in the application's access control mechanisms to enforce proper permissions on specific actions or data resources. The issue affects versions of the convertkit-for-woocommerce plugin ranging from initial releases up through version 2.2.0. In this context, the vulnerability allows an attacker to exploit incorrectly configured security levels by performing administrative functions without being authenticated as a user with sufficient privileges. This type of flaw typically arises when the application fails to verify that the current user has the necessary rights before executing sensitive operations, such as modifying plugin settings, accessing customer data, or altering subscription configurations linked to WooCommerce orders.
From an operational perspective, this lack of authorization checks creates a significant risk for website administrators and their customers. An attacker with low-privilege access, such as a subscriber or contributor account on the WordPress site, could potentially escalate their privileges by manipulating requests sent to the plugin's endpoints. By bypassing authentication requirements, the attacker might gain unauthorized control over marketing automation workflows, email list management features, or integration settings that connect WooCommerce sales data with Kit’s CRM and email services. This can lead to a complete compromise of the integrity of customer communications, potential leakage of personally identifiable information stored within subscription records, and disruption of business operations by altering critical configuration parameters without authorization.
The technical execution of this exploit likely involves crafting specific HTTP requests to endpoints managed by the plugin that do not adequately validate the user's role or capability before processing the action. This aligns with common attack patterns observed in web application security where state-changing actions are exposed via GET requests or fail to implement anti-CSRF tokens combined with strict authorization checks. The vulnerability reflects a gap in implementing robust identity and access management controls, allowing malicious actors to interact with administrative features that should be restricted exclusively to users holding the administrator role within the WordPress ecosystem.
To mitigate this risk, immediate action is required by updating the convertkit-for-woocommerce plugin to a version later than 2.2.0, where these authorization checks have presumably been corrected by the developers. Administrators should also ensure that their WordPress installation follows best practices for user management, such as limiting the number of users with administrator privileges and enforcing strong password policies. Additionally, implementing web application firewalls can provide an additional layer of defense by detecting and blocking anomalous request patterns associated with privilege escalation attempts. Regular security audits and penetration testing focused on access control mechanisms are recommended to identify similar gaps in other plugins or custom code within the WordPress environment.