CVE-2026-22792 Overview
CVE-2026-22792 is a critical Cross-Site Scripting (XSS) vulnerability in 5ire, a cross-platform desktop artificial intelligence assistant and model context protocol (MCP) client. Prior to version 0.15.3, the application permits unsafe HTML rendering that allows untrusted HTML content, including event handler attributes like onerror, to execute arbitrary JavaScript in the renderer context. This vulnerability enables attackers to inject malicious payloads that can call exposed bridge APIs, ultimately leading to unauthorized creation of MCP servers and remote command execution.
Critical Impact
Attackers can inject malicious HTML payloads to execute arbitrary JavaScript in the renderer context, enabling unauthorized MCP server creation and remote command execution through exposed bridge APIs.
Affected Products
- 5ire AI Assistant versions prior to 0.15.3
- Cross-platform desktop installations (Windows, macOS, Linux)
- Applications utilizing the MCP client functionality
Discovery Timeline
- 2026-01-21 - CVE CVE-2026-22792 published to NVD
- 2026-01-21 - Last updated in NVD database
Technical Details for CVE-2026-22792
Vulnerability Analysis
This vulnerability stems from improper encoding of output before rendering (CWE-116). The 5ire application fails to properly sanitize HTML content before rendering it in the Electron renderer process. When untrusted HTML is processed, event handler attributes such as onerror on image tags are executed, allowing arbitrary JavaScript code to run within the application's context.
The critical security impact arises from the combination of XSS with exposed bridge APIs. The application's architecture exposes sensitive functionality through window.bridge objects, including window.bridge.mcpServersManager.createServer. When an attacker successfully injects JavaScript, they gain the ability to call these privileged APIs, effectively bypassing the intended security boundaries between web content and system-level functionality.
The network attack vector combined with the scope change (meaning the vulnerability impacts resources beyond its security scope) makes this particularly dangerous. An attacker can craft malicious content that, when processed by a user, executes code that can manipulate the MCP server infrastructure and potentially achieve remote command execution on the victim's system.
Root Cause
The root cause is improper output encoding (CWE-116) in the HTML rendering pipeline. The application fails to sanitize or escape user-controlled or externally-sourced HTML content before inserting it into the DOM. This allows attackers to inject HTML elements with event handlers that execute JavaScript code. The exposed bridge APIs compound the issue by providing attackers with powerful capabilities once they achieve code execution in the renderer context.
Attack Vector
An attacker can craft a malicious payload containing an HTML image tag with an intentionally broken source URL and an onerror event handler. When the application attempts to render this content and fails to load the image, the onerror handler executes. The injected JavaScript can then access the exposed window.bridge.mcpServersManager.createServer API to create unauthorized MCP servers. These malicious servers can subsequently be leveraged for remote command execution on the target system.
The attack requires user interaction in the form of viewing or processing the malicious content within the 5ire application. The payload executes with the privileges of the Electron renderer process, which has access to the exposed bridge APIs designed for legitimate application functionality.
Detection Methods for CVE-2026-22792
Indicators of Compromise
- Unexpected MCP server registrations or configurations in the 5ire application
- JavaScript execution logs showing calls to window.bridge.mcpServersManager functions
- Suspicious HTML content containing onerror, onload, or other event handler attributes in application data
- Anomalous network connections initiated by newly created MCP servers
Detection Strategies
- Monitor for HTML event handler patterns (onerror=, onload=, onclick=) in application input streams
- Implement Content Security Policy (CSP) violations logging to detect inline script execution attempts
- Audit MCP server creation events for unauthorized or unexpected server registrations
- Deploy endpoint detection to identify suspicious child process spawning from the 5ire application
Monitoring Recommendations
- Enable verbose logging for MCP server management operations
- Monitor process creation events for unusual commands spawned by the 5ire application
- Implement network traffic analysis to detect connections to unknown or suspicious MCP endpoints
- Configure alerts for rapid creation of multiple MCP servers which may indicate exploitation attempts
How to Mitigate CVE-2026-22792
Immediate Actions Required
- Upgrade 5ire to version 0.15.3 or later immediately
- Review existing MCP server configurations for any unauthorized entries
- Audit application logs for signs of exploitation prior to patching
- Consider temporarily disabling the application if immediate upgrade is not possible
Patch Information
The vulnerability has been addressed in 5ire version 0.15.3. The fix implements proper HTML sanitization to prevent execution of untrusted event handlers in the renderer context. Users should upgrade to this version or later to remediate the vulnerability. For detailed information about the patch, refer to the GitHub Release v0.15.3 and the GitHub Security Advisory GHSA-p5fm-wm8g-rffx.
Workarounds
- Avoid processing untrusted content or data from unknown sources until the patch is applied
- Implement network segmentation to limit the impact of any unauthorized MCP server creation
- Review and restrict bridge API exposure if custom application modifications are possible
- Monitor MCP server configurations and immediately remove any unauthorized entries
# Verify 5ire version and upgrade if necessary
# Check current version in application settings or package info
# Upgrade to patched version
npm update 5ire@0.15.3
# Or download latest release from GitHub releases page
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
