CVE-2023-33211 in WP-Matomo Integration Plugin
Summary
by MITRE • 05/28/2023
Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in André Bräkling WP-Matomo Integration (WP-Piwik) plugin <= 1.0.27 versions.
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Analysis
by VulDB Data Team • 06/21/2023
The vulnerability CVE-2023-33211 represents a critical stored cross-site scripting flaw within the WP-Matomo Integration plugin, formerly known as WP-Piwik, affecting versions up to and including 1.0.27. This security weakness resides in the plugin's administrative interface where unauthenticated attackers with administrator privileges or higher can exploit the vulnerability to inject malicious scripts into the application's database. The flaw specifically manifests when the plugin processes user input through administrative forms, failing to properly sanitize or escape data before storing it in the WordPress database, creating a persistent XSS vector that can affect all users who view the compromised content.
The technical implementation of this vulnerability stems from inadequate input validation and output escaping mechanisms within the plugin's backend processing functions. When administrators configure tracking settings or manage plugin options through the WordPress admin dashboard, the plugin fails to implement proper sanitization routines for user-supplied data. This allows malicious actors with administrative access to craft specially crafted payloads that get stored in the database and subsequently executed whenever legitimate users access the affected administrative pages. The vulnerability classifies under CWE-79 as it involves the improper neutralization of input during web page generation, and it aligns with ATT&CK technique T1566.001 for the initial compromise through credential theft or privilege escalation.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to perform session hijacking, steal administrative credentials, and potentially escalate privileges within the WordPress environment. The stored nature of the vulnerability means that once exploited, the malicious scripts persist indefinitely until manually removed from the database, creating a long-term threat vector. Attackers could leverage this weakness to inject malicious JavaScript that redirects users to phishing sites, steals cookies and session tokens, or even modifies plugin configurations to maintain persistent access. The vulnerability affects all WordPress installations using the affected plugin version, making it particularly dangerous as it can be exploited across multiple sites without requiring additional attack vectors.
Mitigation strategies for CVE-2023-33211 should prioritize immediate plugin updates to version 1.0.28 or later, which contain the necessary patches to address the XSS vulnerability. Organizations should also implement comprehensive input validation measures and ensure that all administrative users employ strong authentication practices including multi-factor authentication. Additionally, security monitoring should be enhanced to detect unusual administrative activities and unauthorized code injections within the WordPress database. Regular security audits of installed plugins and themes should be conducted to identify similar vulnerabilities, while network traffic monitoring can help detect malicious payloads being executed in the browser. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing proper input sanitization practices in web applications to prevent persistent XSS attacks.