CVE-2026-1569 in Wueen Plugin
Summary
by MITRE • 03/07/2026
The Wueen plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's `wueen-blocket` shortcode in all versions up to, and including, 0.2.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 03/08/2026
The vulnerability identified as CVE-2026-1569 affects the Wueen plugin for WordPress, specifically targeting versions up to and including 0.2.0. This represents a critical security flaw that exploits stored cross-site scripting vulnerabilities within the plugin's shortcode functionality. The issue manifests through the `wueen-blocket` shortcode which fails to properly sanitize or escape user-supplied input attributes, creating an attack vector that can be exploited by malicious actors with contributor-level privileges or higher. The vulnerability's classification aligns with CWE-79, which specifically addresses cross-site scripting flaws where insufficient input validation and output escaping create opportunities for attackers to inject malicious scripts into web applications.
The technical implementation of this vulnerability occurs when authenticated users with contributor access or above manipulate the plugin's shortcode functionality by providing malicious input through attributes. These attributes are then stored within the WordPress database and executed whenever legitimate users access pages containing the compromised shortcode. This stored nature of the XSS vulnerability means that the malicious scripts persist and execute automatically without requiring additional user interaction, making it particularly dangerous for widespread impact. The flaw stems from inadequate input sanitization processes that should validate and filter all user-provided data before it is processed or stored, combined with insufficient output escaping mechanisms that fail to properly encode data when rendered in web pages.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform various malicious activities including session hijacking, credential theft, data exfiltration, and potential privilege escalation within the WordPress environment. Attackers can leverage this vulnerability to inject scripts that redirect users to malicious sites, steal cookies and session tokens, or even modify content displayed to other users. The contributor-level access requirement limits the immediate threat to systems where such privileges are properly restricted, but it still represents a significant risk when administrators grant elevated permissions to untrusted users or when privilege escalation techniques are subsequently employed. This vulnerability directly impacts the integrity and confidentiality of WordPress installations, potentially compromising the entire site if attackers successfully leverage the XSS to gain further access.
Mitigation strategies for CVE-2026-1569 should focus on immediate remediation through plugin updates to versions that address the sanitization and escaping flaws. Administrators must ensure that all users with contributor-level access or higher are properly vetted and that privilege levels are restricted according to the principle of least privilege. Input validation should be strengthened to filter all user-supplied attributes before storage, while output escaping mechanisms must be implemented to properly encode data when rendered in web contexts. The implementation of Content Security Policy headers can provide additional defense-in-depth measures to limit the impact of successful XSS attacks. Regular security audits and monitoring of plugin functionality should be conducted to identify similar vulnerabilities, with the ATT&CK framework's T1566.001 technique for "Phishing with Social Engineering" highlighting the importance of protecting against user interaction with malicious payloads. Organizations should also implement proper access control measures and regularly review user permissions to prevent unauthorized privilege escalation that could enable exploitation of this vulnerability.