CVE-2026-86788 in HT Mega Addons for Elementor Plugin
Summary
by MITRE • 09/17/2026
The HT Mega Addons for Elementor WordPress plugin before 3.2.6 does not restrict the HTML tag name used to render the section headline in several of its widgets and blocks to a safe allowlist, allowing users with contributor-level access and above to store a crafted tag name that executes arbitrary JavaScript when the content is viewed, including by higher-privileged users who review or publish it.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/17/2026
The vulnerability identified in HT Mega Addons for Elementor prior to version 3.2.6 represents a significant security flaw within the WordPress ecosystem, specifically categorized as an Unrestricted HTML Tag Name issue. This defect stems from inadequate input validation mechanisms embedded within several widgets and blocks designed to render section headlines. Instead of enforcing a strict allowlist that permits only safe, predefined HTML tags such as headings or paragraphs, the plugin accepts arbitrary tag names provided by the user during content creation. This lack of sanitization allows attackers with contributor-level access or higher to inject malicious markup directly into the page structure. The core technical failure lies in the absence of rigorous filtering logic on the server side before the data is persisted and subsequently rendered for end-users, creating a direct pathway for Cross-Site Scripting attacks within an administrative context.
From a technical perspective, this vulnerability enables Stored Cross-Site Scripting by allowing malicious actors to craft specific HTML tag names that contain JavaScript event handlers or script elements. When a user with elevated privileges, such as an editor or administrator, views the page containing this crafted content—whether for review, editing, or publication—the browser interprets the custom tag name and executes the embedded malicious code. This execution occurs in the context of the privileged user's session, granting the attacker the ability to perform actions on behalf of that user. The impact is severe because it bypasses standard role-based access controls by leveraging the trust relationship between the administrator account and the website backend. Attackers can steal administrative cookies, hijack sessions, deface websites, or use the compromised site as a vector for further attacks against visitors who view the infected pages.
The operational impact of this vulnerability extends beyond simple script execution to include potential data exfiltration and complete compromise of the WordPress installation if combined with other vulnerabilities. Since the malicious content is stored in the database, it persists until manually removed or overwritten by legitimate updates. This makes detection difficult for site owners who may not regularly inspect raw HTML source code within their posts or pages. The vulnerability affects multiple widgets and blocks within the HT Mega plugin suite, indicating a systemic issue with how input validation is implemented across different components of the add-on pack rather than an isolated incident in a single feature.
To mitigate this risk, immediate action must be taken by updating the HT Mega Addons for Elementor to version 3.2.6 or later, where these restrictions have been properly enforced. Site administrators should also audit existing content for any suspicious HTML structures that may have been injected prior to the update. Implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious payloads before they reach the application logic. Furthermore, adhering to the principle of least privilege is critical; ensuring that only trusted users with essential roles are granted contributor-level access or higher reduces the attack surface significantly. Regular security audits and code reviews focusing on input validation practices will help prevent similar vulnerabilities in future plugin updates.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. Specifically, it relates to the failure to validate allowed tags during HTML rendering. In terms of the MITRE ATT&CK framework for enterprise security, this flaw facilitates techniques associated with Initial Access and Execution through browser-based attacks. The ability to execute arbitrary code in a privileged context underscores the importance of robust input sanitization strategies in all web applications that handle user-generated content. Developers must ensure that allowlists are strictly enforced rather than relying on blacklist approaches or incomplete validation logic to secure dynamic HTML generation processes.