CVE-2026-39780 in Youzify Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated Cross Site Scripting (XSS) in Youzify <= 1.3.7 versions.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within the Youzify plugin for WordPress, affecting versions up to and including 1.3.7, represents a significant security risk due to its lack of authentication requirements. This specific type of vulnerability allows attackers to inject malicious client-side scripts into web pages viewed by other users without needing valid credentials or prior login access. The root cause typically lies in the insufficient sanitization or validation of user-supplied input that is subsequently rendered directly into the browser's Document Object Model without proper encoding. In the context of Youzify, which enhances social networking features on WordPress sites, such inputs often originate from public-facing forms, profile fields, or activity streams where data entry is open to all visitors.
From a technical perspective, this flaw aligns with CWE-79, commonly known as Improper Neutralization of Input During Web Page Generation. The vulnerability manifests when the application takes raw user input and outputs it into an HTML context without applying appropriate encoding mechanisms such as htmlspecialchars or equivalent functions in PHP. This allows an attacker to craft a malicious payload containing JavaScript code that executes within the victim's browser session. Because the attack is unauthenticated, the barrier to entry for exploitation is exceptionally low, enabling any internet user with basic knowledge of web technologies to initiate the attack vector against unsuspecting site visitors.
The operational impact of this vulnerability extends beyond simple script execution. Attackers can leverage cross-site scripting to perform a variety of malicious actions depending on the context and privileges of the targeted users. Common impacts include session hijacking, where stolen cookies or authentication tokens are exfiltrated to the attacker's server, allowing them to impersonate legitimate users. Additionally, attackers may redirect victims to phishing sites designed to steal credentials for other services, deface the website by altering its visual presentation, or deploy keyloggers to capture sensitive information typed into forms on the site. In environments where administrative accounts are targeted, the consequences can be severe, potentially leading to full compromise of the underlying WordPress installation and associated data stores.
This vulnerability maps directly to several techniques within the MITRE ATT&CK framework for web applications. Specifically, it corresponds to T1059, Command and Scripting Interpreter, as JavaScript is used to execute commands or actions on behalf of the user. It also relates to T1204, User Execution, where the victim is tricked into performing an action that leads to compromise, often through social engineering tactics like sending a malicious link via email or messaging platforms. The unauthenticated nature further aligns with initial access vectors that do not require prior privilege escalation, making it a high-priority issue for remediation in public-facing web applications.
Mitigation strategies must focus on both immediate patching and long-term secure coding practices. The most effective solution is to upgrade the Youzify plugin to version 1.3.8 or later, where developers have presumably addressed the input validation flaws responsible for this vulnerability. Administrators should verify that all plugins are kept up-to-date with security releases provided by their vendors. In addition to patching, implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious payloads before they reach the application logic. Security headers such as Content-Security-Policy should also be configured to restrict the sources from which scripts can be loaded and executed, thereby mitigating the impact even if some injection attempts succeed. Regular security audits and code reviews focusing on input sanitization are essential for preventing similar vulnerabilities in future development cycles.