Description

Unauthenticated Cross Site Scripting (XSS) in RTMKit <= 2.1.5 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-09-03T17:17:27.450Z",
  "pubdate": "2026-09-03T17:17:27.450Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability exists in RTMKit versions 2.1.5 and earlier, stemming from improper neutralization of user-supplied input.\nThis vulnerability allows unauthenticated remote attackers to inject and execute arbitrary JavaScript code within the context of a victim's browser session.\nThe primary impact includes the unauthorized execution of scripts that can lead to session hijacking, sensitive data theft, such as cookies or local storage contents, and the potential for defacement or redirection of the user to malicious sites.\nThe vulnerability does not require authentication or elevated privileges, making it accessible to any remote attacker capable of sending a crafted request to the application.\nBecause the XSS occurs in an unauthenticated state, it poses a significant threat to all users accessing the affected RTMKit-powered platform, as the payload execution occurs automatically upon the victim interacting with the maliciously crafted URL or element.\nRisk implications include potential account takeover and unauthorized actions performed on behalf of the victim, undermining the overall integrity and confidentiality of the web application session.",
  "technicalDetails": "The vulnerability is identified as a Cross-Site Scripting (XSS) flaw in RTMKit versions <= 2.1.5, characterized by the application's failure to sanitize or encode input parameters before rendering them in the server's response. This lack of input validation allows an attacker to inject arbitrary HTML and JavaScript into the web application's document object model (DOM).\nIn a typical attack scenario, the attacker identifies an input vector—such as a query parameter or form field—that is processed by the RTMKit framework and subsequently reflected back into the browser's rendered output without proper encoding. The attacker crafts a malicious URI containing a payload (e.g., <script>alert(document.cookie)</script>) designed to execute in the user's browser.\nThe attack flow begins when an attacker distributes this crafted URL to targeted users via social engineering, phishing, or by embedding it within a compromised site. When the victim clicks the link, the RTMKit-based application receives the request containing the malicious payload. Because the application logic fails to perform context-aware output encoding (such as converting special characters like '<', '>', and '\"' into their corresponding HTML entities), the browser interprets the injected script as legitimate code provided by the site origin.\nOnce the payload is rendered, the JavaScript executes within the security context of the victim's session. This grants the attacker several post-exploitation capabilities: they can steal session cookies, access sensitive data transmitted within the page, perform unauthorized actions on behalf of the user by making asynchronous requests to the backend, or deploy keyloggers. Since the application does not require prior authentication to trigger this reflection, the attack surface is broad, encompassing any user who can be coerced into visiting the crafted link.\nThe vulnerability lies within the underlying handling of input parameters within the RTMKit framework components responsible for rendering dynamic content. Because the framework does not implement a restrictive content security policy (CSP) or utilize secure templating engines that enforce auto-escaping by default, the rendered content remains vulnerable to manipulation. The flaw is persistent in all versions up to 2.1.5, necessitating a comprehensive review of how inputs are parsed, processed, and subsequently reflected to the client-side interface."
}