CVE-2026-97396 in Email Marketing for WooCommerce Plugin
Summary
by MITRE • 10/10/2026
The Email Marketing for WordPress and WooCommerce – Retainful plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'data' parameter in all versions up to, and including, 1.0.10 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-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 • 10/10/2026
The Email Marketing for WordPress and WooCommerce plugin, known as Retainful, contains a critical security flaw affecting all versions up to and including 1.0.10. This vulnerability is classified as a Stored Cross-Site Scripting (XSS) issue, which represents one of the most prevalent and dangerous web application vulnerabilities according to industry standards such as CWE-79. The root cause lies in insufficient input sanitization and output escaping within the plugin's handling of the 'data' parameter. Unlike reflected XSS attacks where malicious scripts are executed immediately via a crafted link, stored XSS involves persisting the malicious payload on the target server. In this specific case, an attacker can inject arbitrary web scripts that are saved by the application and subsequently served to other users when they access pages containing the injected content. This persistence mechanism significantly amplifies the potential impact of the vulnerability compared to transient injection flaws.
The operational requirements for exploiting this vulnerability involve authenticated attackers possessing subscriber-level access or higher privileges within the WordPress environment. While this requirement limits the pool of potential initial attackers, it remains a significant risk because many legitimate users hold such permissions. Once an attacker with these credentials successfully injects the malicious script through the vulnerable 'data' parameter, the payload becomes part of the stored data on the server. Consequently, whenever any user accesses a page that renders this specific data without proper escaping, the browser executes the injected JavaScript in the context of the victim's session. This execution occurs within the security boundaries established by the website, allowing the script to interact with the DOM and access sensitive information such as cookies, session tokens, or other protected content stored locally on the user's machine.
The impact of this vulnerability extends beyond simple defacement or minor annoyances. An attacker can leverage the executed scripts to perform a variety of malicious actions, including stealing administrative credentials through cookie theft, performing unauthorized state-changing requests that mimic legitimate user actions, or redirecting users to phishing sites designed to capture sensitive information further. This aligns with several techniques documented in the MITRE ATT&CK framework for web applications, particularly those related to client-side code injection and session hijacking. The ability to execute arbitrary scripts effectively compromises the confidentiality, integrity, and availability of the application's user base, potentially leading to broader system compromise if combined with other vulnerabilities or social engineering tactics.
To mitigate this vulnerability, immediate action is required from site administrators using affected versions of the Retainful plugin. The primary remediation step is to upgrade the plugin to a version newer than 1.0.10, where developers have presumably implemented robust input validation and output encoding mechanisms consistent with OWASP guidelines for preventing XSS attacks. Input sanitization should ensure that only expected data types are accepted, while output escaping must convert special characters into their HTML entity equivalents before rendering them in the browser context. Additionally, implementing a Content Security Policy (CSP) can provide an additional layer of defense by restricting the sources from which scripts can be loaded and executed, thereby mitigating the impact even if some injection attempts succeed. Regular security audits and penetration testing are also recommended to identify similar flaws across other plugins and themes within the WordPress ecosystem, ensuring comprehensive protection against evolving web-based threats.