Description

Unauthenticated Cross Site Scripting (XSS) in Thrive Architect <= 10.9.3.1 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-06T15:17:22.483Z",
  "pubdate": "2026-08-06T15:17:22.483Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the Thrive Architect product, specifically affecting versions 10.9.3.1 and prior. This security flaw enables remote, unauthenticated attackers to inject malicious client-side scripts, typically JavaScript, into web pages rendered by the vulnerable application and subsequently viewed by legitimate users.\nThe primary impact of this vulnerability includes session hijacking, credential theft, sensitive data exposure, and unauthorized actions performed on behalf of authenticated users interacting with the compromised application. Given that the flaw is unauthenticated, attackers require no prior access credentials or elevated privileges to initiate an attack vector.\nExploitation relies on the application failing to properly sanitize or encode user-supplied input before reflecting or rendering it within the Document Object Model (DOM) of the browser. The risk implications are severe for deployments utilizing affected versions of Thrive Architect, as successful exploitation compromises the integrity of the application and the confidentiality of client sessions.\nRemediation requires immediate administrative action to update the software beyond the vulnerable version threshold or apply official vendor patches as soon as they become available.",
  "technicalDetails": "The vulnerability exists within the input handling and output rendering mechanisms of Thrive Architect versions 10.9.3.1 and lower. The root cause stems from improper neutralization of user-supplied input, allowing malicious payloads to be injected into the application context without adequate validation, sanitization, or contextual output encoding.\nBecause the attack vector is unauthenticated, an external threat actor with network exposure to the web application can initiate the attack sequence remotely without requiring pre-existing user accounts or administrative privileges.\nThe exploitation method involves crafting a malicious HTTP request containing arbitrary script payloads directed at vulnerable endpoints within the Thrive Architect codebase. When the application processes the input and subsequently reflects or stores it without proper sanitization, the payload is integrated directly into the Hypertext Markup Language (HTML) response returned to the client.\nThe attack flow proceeds as follows: First, the attacker identifies a vulnerable parameter or input field processed by Thrive Architect. Second, the attacker crafts a malicious Uniform Resource Locator (URL) or submits an HTTP request containing the unencoded script payload (e.g., HTML or JavaScript). Third, the vulnerable component fails to sanitize the input and incorporates the malicious payload into the rendered page output. Fourth, a victim user navigates to the compromised page or interacts with the crafted link. Finally, the victim's web browser executes the injected script within the context of their active session.\nThe payload behavior involves executing arbitrary JavaScript in the victim's browser session. This grants the attacker the ability to access Document Object Model (DOM) elements, manipulate page content, read cookies or session storage tokens, and perform unauthorized API requests acting as the victim user.\nThe post-exploitation impact includes complete session compromise, potential escalation of privileges if an administrative user views the payload, and unauthorized data exfiltration depending on the permissions and scope of the affected application."
}