CVE-2024-4608 in SellKit Plugin
Summary
by MITRE • 06/06/2024
The SellKit – Funnel builder and checkout optimizer for WooCommerce to sell more, faster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' parameter in all versions up to, and including, 1.9.8 due to insufficient input sanitization and output escaping. 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 • 03/26/2025
The vulnerability identified as CVE-2024-4608 affects the SellKit plugin for WordPress, specifically targeting versions up to and including 1.9.8. This plugin serves as a funnel builder and checkout optimizer for WooCommerce stores, making it a critical component in e-commerce operations. The flaw resides in the inadequate sanitization and escaping of user input within the 'id' parameter, creating a persistent cross-site scripting vulnerability that can be exploited by authenticated attackers. The vulnerability's severity is amplified by the fact that it requires only contributor-level access or higher, making it particularly dangerous as it can be leveraged by users who already have significant privileges within the WordPress environment.
The technical implementation of this vulnerability stems from insufficient validation of the 'id' parameter when processing user input. When an authenticated user with contributor privileges or higher submits data containing malicious script code through this parameter, the plugin fails to properly sanitize or escape the input before storing it in the database. This stored malicious content then executes whenever any user accesses a page that contains the injected script, creating a persistent XSS vector. The vulnerability manifests as a stored cross-site scripting attack because the malicious payload is saved server-side and executed against all users who view the affected pages, rather than being reflected in a single request.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities within the context of the victim's browser session. Attackers can leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious sites, or even escalate their privileges further within the WordPress environment. The fact that this vulnerability affects a plugin used for e-commerce transactions makes it particularly concerning, as attackers could potentially intercept sensitive customer data, manipulate transaction flows, or gain deeper access to the store's administrative functions. The contributor-level access requirement means that even less privileged users within the WordPress environment could exploit this weakness, making it a significant risk for sites with multiple users or those that don't properly enforce role-based access controls.
Security mitigations for this vulnerability should focus on immediate patching of the SellKit plugin to version 1.9.9 or later, which contains the necessary input sanitization fixes. Organizations should also implement additional defensive measures including regular security audits of installed plugins, enforcement of the principle of least privilege for WordPress user accounts, and implementation of web application firewalls that can detect and block suspicious input patterns. The vulnerability aligns with CWE-79 which describes Cross-Site Scripting flaws, and could be categorized under ATT&CK technique T1566.001 for the initial compromise through phishing or credential theft that leads to contributor-level access, followed by T1059.001 for the execution of malicious scripts. Organizations should also consider implementing Content Security Policy headers as an additional defense-in-depth measure to limit the impact of potential XSS attacks, though this does not replace proper input validation and sanitization. Regular monitoring of plugin repositories and security advisories should be maintained to ensure early detection of similar vulnerabilities in other WordPress plugins that may present similar attack vectors.