CVE-2026-104670 in LearnPress Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated Cross Site Scripting (XSS) in LearnPress <= 4.4.9 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 LearnPress plugin for WordPress, specifically affecting versions up to and including 4.4.9, represents a significant security risk due to its lack of authentication requirements. This characteristic allows any remote attacker who can access the target website's public-facing interface to exploit the weakness without needing valid credentials or prior authorization. The core technical flaw stems from insufficient sanitization and validation of user-supplied input before it is processed by the application logic. In many cases involving this type of vulnerability within WordPress plugins, the issue arises when data submitted through forms, such as registration fields, comment sections, or quiz submission interfaces, is reflected back to the browser in an unsafe manner. The application fails to properly encode special characters that have semantic meaning in HTML and JavaScript contexts, thereby allowing malicious scripts to be injected into the page content served to other users.
From a technical perspective, this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation as Cross-site Scripting. The attack vector typically involves an attacker crafting a URL or form payload containing executable JavaScript code disguised within seemingly benign data fields. When the vulnerable endpoint processes this input and renders it in the response without adequate encoding, the browser interprets the injected script as part of the legitimate webpage content. This execution occurs within the security context of the target domain, granting the malicious script full access to cookies, session tokens, local storage, and other sensitive data associated with that origin. The unauthenticated nature of this flaw means that the barrier to entry for exploitation is exceptionally low, enabling automated scanning tools and opportunistic attackers to compromise a high volume of vulnerable sites rapidly.
The operational impact of successfully exploiting this vulnerability can be severe and multifaceted. Attackers commonly leverage such XSS flaws to perform session hijacking by stealing administrator or user cookies, thereby gaining unauthorized access to the WordPress dashboard and associated learning management system data. Beyond account takeover, attackers may deploy phishing pages that mimic legitimate login screens to harvest credentials from unsuspecting users visiting the compromised site. Additionally, the vulnerability can be used to deface the website's appearance, redirect traffic to malicious domains for malware distribution, or execute actions on behalf of authenticated users if they are tricked into clicking a crafted link while logged in. This undermines the integrity and confidentiality of the educational platform, potentially exposing sensitive student information, course materials, and administrative configurations to unauthorized parties.
In terms of threat intelligence frameworks, this vulnerability is associated with MITRE ATT&CK techniques related to Client-side Injection, specifically T1059 which covers command and script interpretation through browser-based execution. The unauthenticated aspect places it within the initial access or persistence phases depending on how the attacker utilizes the stolen session tokens or injected scripts. To mitigate this risk, immediate action is required by updating the LearnPress plugin to a version newer than 4.4.9 where these input validation issues have been addressed by the developers. Administrators should also implement Web Application Firewalls that can detect and block common XSS payloads in HTTP requests as an additional layer of defense. Furthermore, enforcing strict Content Security Policy headers on the web server can significantly reduce the impact of any successful injection attempts by restricting the sources from which scripts are allowed to execute. Regular security audits and code reviews focusing on input handling practices are essential for preventing similar vulnerabilities in future updates or custom integrations within the WordPress ecosystem.