CVE-2026-42636 in Cookie Notice for GDPR, CCPA & ePrivacy Consent Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated Cross Site Scripting (XSS) in WP Cookie Notice for GDPR, CCPA & ePrivacy Consent <= 4.4.6 versions.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within the WP Cookie Notice plugin for GDPR, CCPA, and ePrivacy consent prior to version 4.4.7 represents a significant security risk for websites relying on this widely used compliance tool. This specific weakness stems from insufficient input validation and sanitization mechanisms when processing user-supplied data that is subsequently rendered in web pages without proper encoding. The core technical flaw lies in the application's failure to adequately filter special characters or escape output contexts, allowing an attacker to inject malicious JavaScript code into the page content. Because this vulnerability exists at a level accessible by unauthenticated users, it does not require any form of user authentication or privileged access on the target WordPress installation. This characteristic significantly lowers the barrier for exploitation, enabling anyone with internet connectivity and knowledge of web technologies to initiate attacks against visitors of affected sites.
From an operational perspective, the impact of this vulnerability is severe due to its potential to compromise the confidentiality, integrity, and availability of user data associated with website visitors. An attacker can exploit this flaw by crafting a malicious link or embedding code within comments or other input fields that are processed by the plugin's frontend interface. When another user visits the compromised page, their browser executes the injected script in the context of the vulnerable site. This allows the attacker to perform actions such as stealing session cookies, hijacking active sessions, performing unauthorized state-changing requests on behalf of the victim, or redirecting users to phishing sites designed to steal credentials. The ability to execute scripts without authentication means that even anonymous visitors can trigger these attacks, making it a persistent threat vector for any site running the affected versions.
This vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. It also maps directly to MITRE ATT&CK technique T1059.007, specifically JavaScript execution within a browser environment. The exploitation path typically involves the attacker constructing a payload that bypasses existing filters and injects script tags or event handlers into the DOM. Once executed, this code operates with the same permissions as legitimate scripts from the domain, granting it access to local storage, cookies, and other sensitive information stored by the website for authenticated users. The lack of authentication requirement exacerbates the risk profile because traditional defenses that rely on user identity verification are rendered ineffective against such attacks.
Mitigation strategies must focus primarily on immediate software updates as well as long-term secure coding practices. Site administrators should upgrade the WP Cookie Notice plugin to version 4.4.7 or later, where these input validation and output encoding issues have been addressed by the developers. In addition to updating, implementing a Web Application Firewall can provide an additional layer of defense by detecting and blocking common XSS payloads before they reach the application logic. Developers should ensure that all user inputs are strictly validated against expected formats and that outputs are properly encoded based on their context within HTML, JavaScript, or CSS structures. Regular security audits and penetration testing focused on input handling mechanisms will help identify similar weaknesses in other plugins or custom code components used by the organization.