CVE-2026-66688 in Ultimate Addons for Elementor Plugin
Summary
by MITRE • 08/06/2026
Contributor Cross Site Scripting (XSS) in Ultimate Addons for Elementor <= 1.45.2 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability under discussion represents a contributor cross site scripting flaw within the Ultimate Addons for Elementor plugin, affecting versions up to and including 1.45.2. This security issue enables unauthorized users with contributor level privileges to execute malicious scripts in the context of other users' browsers. The vulnerability stems from insufficient input validation and output escaping mechanisms within the plugin's codebase, specifically when processing user-generated content or form submissions. Contributors in WordPress typically have limited capabilities including publishing posts, uploading files, and managing their own content, but this particular flaw allows them to escalate their privileges through malicious script injection.
The technical implementation of this XSS vulnerability occurs when the plugin fails to properly sanitize or escape user input before rendering it within web pages. When a contributor creates or modifies content that gets displayed on public-facing pages or admin interfaces, the malicious payload can be executed in visitors' browsers or administrator sessions. The flaw likely exists in areas where the plugin processes shortcode parameters, form data, or user-generated content without adequate sanitization routines. This type of vulnerability falls under CWE-79 which specifically addresses cross site scripting flaws in web applications.
The operational impact of this contributor XSS vulnerability extends beyond simple script execution as it can lead to session hijacking, credential theft, and unauthorized administrative actions. An attacker with contributor access could inject scripts that steal administrator cookies, redirect users to malicious sites, or manipulate the plugin's functionality to perform unauthorized operations. The attack vector typically involves crafting malicious content through the plugin's interface or submitting data that gets processed and rendered without proper escaping. This vulnerability represents a significant concern for WordPress sites using Ultimate Addons for Elementor as it allows attackers to leverage contributor accounts to compromise entire websites.
Mitigation strategies for this vulnerability should include immediate patching to versions 1.45.3 and later where the XSS flaws have been addressed through proper input sanitization and output escaping mechanisms. Site administrators should also implement comprehensive monitoring of contributor activities and consider role-based access restrictions to limit the potential impact of compromised accounts. The implementation of content security policies can provide additional defense in depth against such attacks, while regular security audits and vulnerability assessments help identify similar issues across the entire WordPress ecosystem. This vulnerability aligns with ATT&CK technique T1059.007 which covers scripting through web shells and malicious script injection methods commonly exploited by attackers targeting content management systems.