CVE-2026-89002 in WPeMatico RSS Feed Fetcher Plugin
Summary
by MITRE • 09/24/2026
The WPeMatico RSS Feed Fetcher WordPress plugin before 2.8.26 does not sanitize and escape content it retrieves from a user-supplied source before rendering it, which could allow users such as contributors to perform Stored Cross-Site Scripting attacks against higher-privileged users who review the campaign.
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Analysis
by VulDB Data Team • 09/24/2026
The vulnerability identified in WPeMatico RSS Feed Fetcher versions prior to 2.8.26 represents a critical security flaw rooted in insufficient input validation and output encoding mechanisms within the WordPress plugin architecture. This specific weakness allows for Stored Cross-Site Scripting, commonly referred to as XSS, which is categorized under CWE-79 in the Common Weakness Enumeration standard. The core technical failure lies in the application's handling of data retrieved from external RSS feeds provided by users. When a user supplies an RSS feed source, the plugin fetches content from that remote location and subsequently renders it within the WordPress environment without applying adequate sanitization or escaping procedures. This lack of proper encoding means that any malicious script embedded within the fetched content is preserved in its executable form rather than being neutralized into harmless text data.
The operational impact of this vulnerability is significant due to the specific privilege level required for exploitation and the nature of stored attacks. Unlike reflected XSS, where an attacker must trick a user into clicking a malicious link, stored XSS persists on the target server. In this context, users with lower privileges, such as contributors or authors, can inject malicious JavaScript payloads by configuring their campaigns to point to RSS feeds containing these scripts. Once submitted, the payload is saved in the database associated with the campaign data. When higher-privileged users, such as administrators or editors who review and manage these campaigns, access the affected pages within the WordPress admin dashboard, the browser executes the embedded script automatically. This execution occurs within the context of the victim's session, granting the attacker the ability to perform actions on behalf of the privileged user.
The consequences of successful exploitation can be severe, potentially leading to full account compromise if administrative privileges are targeted. Attackers may steal administrator cookies or authentication tokens, hijack sessions, deface websites by altering content displayed in the dashboard, or redirect users to malicious phishing sites. Furthermore, because WordPress plugins often have broad access to site functionality and database contents, a compromised admin session can lead to further lateral movement within the system, installation of additional malware, or exfiltration of sensitive data stored on the server. This aligns with several tactics in the MITRE ATT&CK framework for enterprise security, specifically T1059 Command and Scripting Interpreter through JavaScript execution, and potentially T1078 Valid Accounts if administrative credentials are harvested to maintain persistent access.
Mitigation strategies must focus on immediate remediation of the code flaw and broader defensive measures. The primary solution is to upgrade the WPeMatico plugin to version 2.8.26 or later, where developers have implemented proper sanitization and escaping functions such as wp_kses_post for content rendering. This ensures that only safe HTML tags are allowed while stripping out potentially dangerous scripts like script elements or event handlers. For organizations unable to update immediately due to compatibility constraints, temporary workarounds include restricting the ability of lower-privileged users to create campaigns with external RSS sources until patches can be applied. Additionally, implementing a Content Security Policy (CSP) header on the WordPress installation can help mitigate the impact by preventing unauthorized script execution from unknown origins. Regular security audits and code reviews focusing on input/output handling are essential to prevent similar vulnerabilities in custom or third-party plugins within the ecosystem.