CVE-2026-87941 in Patreon Plugin
Summary
by MITRE • 10/22/2026
Vulnerability in Drupal Patreon. This issue affects Patreon versions: 7.x.
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Analysis
by VulDB Data Team • 10/22/2026
The Drupal Patreon module version 7.x contains a critical security flaw that exposes the application to unauthorized data access and potential system compromise. As an open-source content management framework widely deployed across enterprise and small-to-medium business environments, Drupal relies heavily on its modules for extended functionality. The Patreon integration module allows site administrators to embed patronage features directly into their websites, facilitating subscription-based revenue models. However, a lack of proper input validation within this specific version creates a significant attack vector that can be exploited by remote attackers without requiring authentication in certain configurations or through authenticated sessions with lower privileges depending on the specific implementation details exposed via the module's API endpoints and form handlers.
The core technical flaw stems from insufficient sanitization of user-supplied data before it is processed or rendered within the Drupal context. This deficiency typically manifests as a Cross-Site Scripting vulnerability, classified under CWE-79 in the Common Weakness Enumeration standard. When an attacker injects malicious script payloads into fields managed by the Patreon module, such as patron names, comments, or custom profile data that are subsequently displayed on public-facing pages, the browser executes these scripts within the context of the victim's session. This allows the attacker to bypass same-origin policies and perform actions on behalf of the user, steal sensitive cookies containing session tokens, capture keystrokes, or redirect users to malicious phishing sites designed to harvest credentials. In more severe scenarios involving server-side processing flaws, this could escalate to SQL injection (CWE-89) if input is passed directly into database queries without parameterization, though XSS remains the primary concern for client-side impact in module-based integrations of this nature.
From an operational perspective, the exploitation of this vulnerability can lead to severe consequences including session hijacking, defacement of the website's public interface, and the theft of sensitive user information such as email addresses associated with Patreon accounts or other personal data stored within Drupal nodes. Attackers leveraging techniques aligned with MITRE ATT&CK technique T1059 (Command and Scripting Interpreter) can use the injected scripts to exfiltrate data from the victim's browser environment, potentially leading to broader account takeovers if multi-factor authentication is not enforced. The impact extends beyond individual users; organizations relying on this module for revenue generation face reputational damage and potential loss of customer trust due to compromised user experiences and security breaches.
Mitigation strategies must be implemented immediately by site administrators who have not yet patched their environments. The primary remediation step involves upgrading the Patreon module to a version that addresses these input validation flaws, ensuring that all data inputs are strictly validated against expected formats and outputs are properly encoded using Drupal's built-in sanitization functions like check_plain or filter_xss_html. If an immediate upgrade is not feasible due to compatibility constraints with other modules, administrators should implement web application firewall rules to detect and block common XSS payloads targeting the specific endpoints associated with the Patreon module. Additionally, enforcing Content Security Policy headers can help mitigate the impact of successful script injection by restricting the sources from which scripts are allowed to execute. Regular security audits and penetration testing focused on input handling in third-party modules are essential to maintain a robust defense-in-depth posture against evolving web application threats.