CVE-2026-119503 in e-Commerce Plugin
Summary
by MITRE • 11/09/2026
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Welcart Welcart e-Commerce usc-e-shop allows Code Injection.This issue affects Welcart e-Commerce: from n/a through 2.12.6.
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Analysis
by VulDB Data Team • 11/09/2026
The identified security flaw represents a classic Cross-Site Scripting vulnerability, specifically categorized under CWE-79 as Improper Neutralization of Script-Related HTML Tags in a Web Page. This type of weakness occurs when an application accepts untrusted input and includes that data within web pages without proper validation or escaping of special characters. In the context of Welcart e-Commerce versions ranging from n/a through 2.12.6, this vulnerability allows attackers to inject malicious scripts into web pages viewed by other users. The root cause lies in the application's failure to sanitize user-supplied data before rendering it within HTML contexts, thereby bypassing standard browser security mechanisms such as the same-origin policy which is designed to restrict how documents or scripts loaded from one origin can interact with resources from another origin.
From a technical perspective, this vulnerability enables Code Injection by allowing an attacker to execute arbitrary JavaScript code in the context of the victim's session. When a user interacts with a compromised page element that processes unsanitized input, the injected script executes within the browser environment associated with the Welcart e-Commerce site. This execution grants the malicious script full access to cookies, local storage, and other sensitive data stored by the website for that specific user session. The attacker can leverage this capability to perform actions on behalf of the victim, such as changing account settings, making unauthorized purchases, or transferring funds if sufficient privileges are held. Furthermore, because the vulnerability is present in a widely used e-commerce plugin, it poses a significant risk to both merchants and their customers who rely on these platforms for secure transactions.
The operational impact of this flaw extends beyond simple defacement or session hijacking. Attackers can utilize persistent XSS vectors by storing malicious scripts within database fields that are subsequently displayed across the platform. This means that every user visiting the affected page becomes a potential victim without needing to click a specially crafted link, significantly increasing the attack surface and ease of exploitation. The ability to inject code also facilitates further attacks such as keylogging, where keystrokes entered by users into login forms or payment fields are captured and exfiltrated to an external server controlled by the attacker. This compromises not only individual privacy but can lead to substantial financial losses for businesses operating on vulnerable instances of Welcart e-Commerce due to fraud, data breaches, and loss of customer trust.
Mitigation strategies must prioritize immediate patching as well as defensive coding practices. The most effective remediation is to upgrade the Welcart e-Commerce plugin to a version later than 2.12.6 where this vulnerability has been addressed by developers through improved input validation and output encoding mechanisms. For organizations unable to immediately update, implementing Web Application Firewall rules can help detect and block common XSS payloads before they reach the application logic. Additionally, adopting Content Security Policy headers is recommended as a defense-in-depth measure; these policies restrict the sources from which scripts can be loaded, thereby neutralizing many injection attempts even if input sanitization fails. Developers should also ensure that all user inputs are strictly validated against expected formats and encoded appropriately for their specific context using libraries designed to prevent HTML entity interpretation during rendering.
This vulnerability aligns with MITRE ATT&CK technique T1059 which covers Command and Scripting Interpreter execution, specifically JavaScript in web-based contexts. It highlights the critical importance of treating all user input as untrusted data regardless of its source or perceived safety. Security teams should conduct regular code reviews focusing on areas where dynamic content is generated from database queries or form submissions to identify similar patterns of improper neutralization. Continuous monitoring for anomalous script execution and implementing strict output encoding standards are essential steps in maintaining the integrity and security posture of web applications susceptible to injection-based attacks.