CVE-2023-26529 in DupeOff Plugin
Summary
by MITRE • 04/03/2023
Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in DupeOff.Com DupeOff plugin <= 1.6 versions.
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Analysis
by VulDB Data Team • 04/21/2023
The CVE-2023-26529 vulnerability represents a critical stored cross-site scripting flaw within the DupeOff plugin for WordPress systems. This vulnerability specifically affects versions 1.6 and earlier, creating a significant security risk for administrators and users who interact with the plugin's administrative interface. The flaw allows authenticated attackers with administrator privileges or higher to inject malicious scripts into the system, which then execute in the context of other users' browsers when they access affected pages. This type of vulnerability falls under the CWE-79 category for Cross-Site Scripting, which is classified as a common weakness in web application security. The ATT&CK framework categorizes this as a technique for code injection within the execution phase, specifically targeting web applications through input validation flaws.
The technical implementation of this vulnerability occurs through improper input sanitization within the DupeOff plugin's administrative components. When administrators or privileged users interact with the plugin's interface to manage duplicate detection settings or review reports, the system fails to properly validate and escape user-supplied data before storing it in the database. This stored data is then retrieved and displayed without adequate sanitization, allowing malicious script payloads to persist and execute when other users view the affected content. The vulnerability is particularly dangerous because it requires only administrative authentication levels, meaning that attackers who have gained access to administrator credentials or have been able to escalate privileges can exploit this flaw without requiring additional attack vectors. The stored nature of the XSS means that the malicious scripts are not limited to a single page view but can affect multiple users over time.
The operational impact of CVE-2023-26529 extends beyond simple data theft or defacement, as it provides attackers with a persistent foothold within compromised WordPress installations. Once exploited, attackers can perform actions such as stealing session cookies, redirecting users to malicious sites, modifying administrative settings, or even creating new administrator accounts to maintain long-term access to the system. The vulnerability particularly affects WordPress sites that rely on the DupeOff plugin for content management or duplicate detection, which are commonly used in e-commerce environments, content management systems, and sites with high volumes of user-generated content. Given that this is a stored XSS vulnerability, the attack surface is significantly expanded as the malicious scripts can affect any user who views the affected content, potentially leading to widespread compromise across multiple user accounts. The impact is further amplified because administrators often spend significant time within the plugin's administrative interface, making them prime targets for exploitation.
Mitigation strategies for CVE-2023-26529 should prioritize immediate plugin updates to versions that address the stored XSS vulnerability, as this represents the most direct solution to the identified flaw. Organizations should also implement additional security measures including input validation and output sanitization at multiple layers within their web applications, ensuring that all user-supplied data is properly escaped before being stored or displayed. Network-based security controls such as web application firewalls can provide additional protection by detecting and blocking known malicious script patterns in HTTP requests. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other plugins or custom code components. The principle of least privilege should be enforced by ensuring that administrative accounts are protected with strong authentication mechanisms including multi-factor authentication, and that access to the DupeOff plugin is restricted to only those users who require administrative capabilities. Organizations should also implement proper monitoring and logging of administrative activities to detect potential exploitation attempts and maintain detailed audit trails of all changes made to the plugin configuration.