Description

Unauthenticated Cross Site Scripting (XSS) in Welcart e-Commerce <= 2.11.31 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-13T14:16:56.640Z",
  "pubdate": "2026-08-13T14:16:56.640Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the Welcart e-Commerce plugin for WordPress, affecting all versions up to and including version 2.11.31. This security flaw allows remote, unauthenticated attackers to inject malicious client-side scripts, typically JavaScript or HTML, into trusted web pages rendered to other users visiting the vulnerable e-commerce platform.\nThe primary impact of this vulnerability includes the potential hijacking of user sessions, theft of sensitive authentication cookies, redirection of users to malicious third-party websites, and the defacement of the affected online storefront. Because the vulnerability requires no prior authentication, external threat actors can target vulnerable instances directly over the network.\nThe risk implication is critical for e-commerce platforms, as successful exploitation against administrative users could lead to full site compromise, arbitrary file manipulation, or execution of malicious actions within the WordPress environment. The exploitation process relies on the application failing to properly sanitize or escape user-supplied input before reflecting it back in the Hypertext Transfer Protocol (HTTP) response.\nMitigation requires upgrading the Welcart e-Commerce plugin to a patched version beyond 2.11.31 as soon as vendor updates become available, alongside implementing robust Web Application Firewall (WAF) filtering rules to detect and block malicious script injection attempts.",
  "technicalDetails": "The vulnerability resides in the input handling and output rendering mechanisms of the Welcart e-Commerce plugin for WordPress, specifically impacting versions 2.11.31 and prior. The root cause stems from improper neutralization of user-supplied input during HTTP request processing, allowing malicious payloads to be reflected directly within the victim's browser context without adequate output encoding or sanitization.\nAs an unauthenticated Cross-Site Scripting (XSS) vector, the flaw does not require the attacker to possess valid user credentials, elevated privileges, or internal access to the WordPress dashboard. The attack surface is exposed directly to the public network via HTTP or HTTPS requests directed at the vulnerable endpoints managed by the plugin.\nThe typical attack flow begins when an unauthenticated adversary crafts a malicious URL containing a payload designed to exploit the lack of input validation within the vulnerable parameter. The attacker then induces a victim—such as a customer browsing the store or an authenticated administrator managing orders—to click the crafted link or visit a compromised resource.\nUpon receiving the malicious request, the server processes the input and reflects the unescaped payload back within the generated HTML response. When the victim's browser parses the HTTP response, it executes the injected script within the security context of the origin site. Because the script executes in the browser of the targeted user, it inherits their session privileges and permissions.\nThe behavior of the payload depends on the attacker's objective. In scenarios where administrative users are targeted, the executed script can perform privileged actions via the WordPress REST API or administrative dashboard, potentially creating new rogue administrator accounts, modifying system settings, or injecting persistent backdoors into the theme and plugin files. When standard users are targeted, the payload can steal session cookies, capture keystrokes, or exfiltrate sensitive personally identifiable information (PII) to an attacker-controlled remote server, resulting in complete session hijacking and data breach."
}