CVE-2026-10511 in Jupiter X Core Plugin
Summary
by MITRE • 10/27/2026
The Jupiter X Core plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'forget_password_link' parameter in all versions up to, and including, 4.61.0 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 • 10/27/2026
The Jupiter X Core plugin for WordPress contains a critical security vulnerability affecting all versions up to and including 4.61.0. This flaw is classified as a Stored Cross-Site Scripting (XSS) issue, specifically triggered through the 'forget_password_link' parameter. The root cause of this vulnerability lies in insufficient input sanitization and output escaping mechanisms within the plugin's codebase. When user-supplied data is processed for password recovery links, the application fails to adequately validate or encode special characters that could be interpreted as executable script content by a web browser. This lack of rigorous validation allows malicious actors to inject arbitrary JavaScript code into stored data fields rather than transient request parameters.
The operational impact of this vulnerability is significant due to its persistent nature. Unlike reflected XSS, where the payload executes only when a victim clicks a specially crafted link, stored XSS persists on the server side. Once an attacker successfully injects their malicious script via the 'forget_password_link' parameter, the code becomes part of the page content served to other users. Consequently, whenever any user accesses a page containing this compromised data, the injected scripts execute automatically in their browser context. This persistence ensures that the attack does not require repeated exploitation attempts for each victim, making it highly effective for widespread compromise or persistent access establishment within the application environment.
Access requirements for exploiting this vulnerability are relatively low but still present specific constraints. The attacker must be an authenticated user with contributor-level access or higher privileges on the WordPress site. This requirement means that while public internet users cannot directly exploit the flaw, any registered member of a community-driven website can potentially leverage it. For sites where contributors have significant control over content creation and management, this represents a substantial risk vector. The attacker does not need administrative rights to execute the initial injection, though they may require such privileges if further escalation or deeper system access is desired after gaining an initial foothold through script execution.
From a technical classification perspective, this vulnerability aligns with CWE-79, which covers Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific mechanism involves the failure to sanitize input data before storage and the subsequent failure to escape output when rendering that stored data back into HTML contexts. This dual failure allows raw script tags or event handlers embedded in the 'forget_password_link' parameter to bypass browser security models designed to prevent unauthorized code execution. Security researchers often map such vulnerabilities to MITRE ATT&CK techniques related to Client-Side Scripting Injection, highlighting how attackers can abuse legitimate application features to deliver malicious payloads without triggering traditional network-based intrusion detection systems that focus on external traffic anomalies rather than internal content manipulation.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The most effective solution is to upgrade the Jupiter X Core plugin to a version newer than 4.61.0, where developers have presumably implemented proper input validation and output encoding routines for the affected parameter. Administrators should verify their current plugin versions regularly through automated monitoring tools or manual checks within the WordPress dashboard. In cases where immediate patching is not feasible due to compatibility concerns with other plugins or themes, temporary workarounds may include restricting contributor-level access to trusted individuals only or implementing a Web Application Firewall rule that detects and blocks attempts to inject script tags into password-related fields. Additionally, enabling Content Security Policy headers can help mitigate the impact of any successful XSS attacks by restricting the sources from which scripts are allowed to load, thereby reducing the effectiveness of injected payloads even if they bypass input filters.
Long-term security hygiene involves adopting a defense-in-depth approach that includes regular code audits focusing on data handling practices. Developers should ensure that all user inputs undergo strict type checking and sanitization before being stored in databases or session variables. Furthermore, output encoding must be context-aware, meaning the method of escaping depends on where the data is rendered within HTML, JavaScript, CSS, or URL contexts. By enforcing these standards across all plugins and themes used by an organization, administrators can significantly reduce the attack surface for cross-site scripting vulnerabilities. Regular penetration testing focused on authentication-bound endpoints will also help identify similar flaws before they can be exploited in production environments, ensuring that security controls evolve alongside application functionality updates.