CVE-2026-84088 in Xpro Addons Plugin
Summary
by MITRE • 09/16/2026
The Xpro Addons — 140+ Widgets for Elementor WordPress plugin before 1.7.9 does not validate or sanitize a widget link setting before storing and using it in a JavaScript navigation call, allowing users with the contributor role and above to inject and store JavaScript that executes in the browser of anyone who interacts with the affected widget.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in Xpro Addons for Elementor WordPress prior to version 1.7.9 represents a significant security flaw rooted in insufficient input validation and sanitization mechanisms within the plugin's architecture. Specifically, the defect resides in how the application handles user-supplied data associated with widget link settings. When a user provides a URL or identifier intended for navigation purposes, the software fails to adequately verify that this input conforms to expected safe formats before persisting it into the database. This lack of rigorous validation allows malicious actors to bypass standard security checks by injecting executable JavaScript code directly into fields that are subsequently rendered in the frontend interface without proper encoding or escaping.
From a technical perspective, this flaw constitutes an Unrestricted Upload of File with Executable Content variant manifested through client-side script injection rather than server-side file execution. The core issue is classified under CWE-79, which covers Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting or XSS. In this specific instance, the vulnerability enables Stored Cross-Site Scripting because the malicious payload is saved in the backend database and then served to other users upon their interaction with the affected widget. The attacker does not need direct access to execute scripts immediately; instead, they embed the script within a legitimate-looking link setting, ensuring that every visitor who clicks or interacts with the compromised element triggers the execution of the injected code in their own browser environment.
The operational impact of this vulnerability is substantial due to its potential for widespread exploitation and data compromise. Since the required privilege level is merely contributor role or above, which is relatively common among content creators and editors on many WordPress sites, the attack surface is broadened significantly compared to vulnerabilities requiring administrator access. Once executed, the injected JavaScript can perform a variety of malicious actions depending on the attacker's intent. These may include stealing session cookies or authentication tokens via document.cookie access, redirecting users to phishing pages designed to harvest credentials, defacing the website content by manipulating the DOM structure, or even performing cross-site request forgery attacks against other administrative functions if combined with additional exploits. The persistence of this data means that remediation requires not only patching the software but also manually cleaning affected records from the database where malicious scripts have already been stored.
Mitigation strategies must address both immediate containment and long-term prevention. Administrators running versions prior to 1.7.9 should upgrade to the latest patched version immediately, as this update includes the necessary input validation and sanitization routines to neutralize such injection attempts. In environments where upgrading is not instantly feasible, implementing a Web Application Firewall can help detect and block requests containing suspicious script patterns in widget settings. Additionally, enforcing strict Content Security Policy headers on the website can mitigate the impact of successful injections by restricting the sources from which scripts are allowed to execute. Regular audits of user-generated content stored within plugin widgets should also be conducted to identify any residual malicious payloads that may have been introduced before the patch was applied.
This vulnerability aligns with MITRE ATT&CK technique T1059, specifically sub-technique 007 for JavaScript execution, illustrating how attackers leverage legitimate application features to execute arbitrary code within a victim's browser context. It also reflects CWE-20 Improper Input Validation, highlighting the critical importance of treating all user-supplied data as untrusted until proven otherwise through rigorous sanitization processes. By understanding these classifications, security teams can better anticipate similar flaws in other plugins that handle dynamic content generation and ensure that future development cycles prioritize secure coding practices to prevent recurrence.