CVE-2025-67230: ToDesktop Builder Privilege Escalation

CVE-2025-67230 Overview

CVE-2025-67230 is a high-severity vulnerability affecting ToDesktop Builder v0.33.0. The vulnerability stems from improper permissions in the handler for the Custom URL Scheme, which allows attackers with renderer-context access to invoke external protocol handlers without sufficient validation. This improper access control issue (CWE-276) could enable malicious actors to exploit the application's protocol handling mechanisms, potentially leading to unauthorized actions on behalf of legitimate users.

Critical Impact

Attackers with renderer-context access can bypass permission checks and invoke external protocol handlers, potentially leading to unauthorized code execution, data exfiltration, or further system compromise.

Affected Products

• ToDesktop Builder v0.33.0

Discovery Timeline

• 2026-01-23 - CVE CVE-2025-67230 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-67230

Vulnerability Analysis

This vulnerability represents an Improper Default Permissions (CWE-276) issue in ToDesktop Builder's Custom URL Scheme handler. ToDesktop Builder is a platform that enables developers to convert web applications into native desktop applications. The affected component handles custom URL schemes, which are used to launch applications and pass data between them through specially crafted URLs.

The core issue lies in insufficient permission validation when the renderer context attempts to invoke external protocol handlers. In Electron-based applications like ToDesktop Builder, the renderer process should have limited privileges compared to the main process. However, due to this vulnerability, attackers who have already gained access to the renderer context can escalate their capabilities by invoking external protocols without proper authorization checks.

Exploitation requires the attacker to first obtain renderer-context access (through techniques like XSS or by compromising a loaded webpage) and then craft malicious protocol invocations. While the attack complexity is high and requires user interaction, successful exploitation could result in high impacts to confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2025-67230 is improper permission enforcement in the Custom URL Scheme handler. The handler fails to adequately validate whether the calling context (renderer process) has appropriate permissions to invoke external protocol handlers. This permissive configuration allows renderer-context code to trigger protocol handlers that should be restricted to more privileged contexts, effectively bypassing the intended security boundaries between processes.

Attack Vector

The attack vector for this vulnerability is network-based. An attacker must first compromise the renderer context, which could be achieved through:

1. Exploiting a cross-site scripting (XSS) vulnerability in a web application loaded by ToDesktop Builder
2. Loading malicious content through the application's webview components
3. Compromising a third-party resource loaded by the application

Once renderer-context access is obtained, the attacker can craft and invoke external protocol handlers without proper validation. The vulnerability requires low privileges and user interaction, making it a targeted attack scenario rather than an opportunistic one. The vulnerability allows the attacker to interact with external applications and system components through protocol handlers, which may include sensitive operations like launching applications, passing arguments, or triggering system-level actions.

Detection Methods for CVE-2025-67230

Indicators of Compromise

• Unexpected external protocol invocations from ToDesktop Builder applications
• Anomalous process spawning triggered by custom URL scheme handlers
• Unusual outbound network connections initiated after protocol handler execution

Detection Strategies

• Monitor for suspicious protocol handler invocations in application logs
• Implement endpoint detection rules for ToDesktop Builder processes invoking unexpected external protocols
• Audit renderer process activities for unauthorized IPC calls to protocol handlers

Monitoring Recommendations

• Enable verbose logging for ToDesktop Builder applications to capture protocol handler activities
• Deploy SentinelOne agents to monitor for behavioral anomalies in Electron-based applications
• Implement network monitoring to detect unusual communication patterns following protocol handler invocations

How to Mitigate CVE-2025-67230

Immediate Actions Required

• Upgrade ToDesktop Builder to a patched version as specified in the vendor security advisory
• Review and restrict Custom URL Scheme permissions in existing ToDesktop Builder configurations
• Implement Content Security Policy (CSP) to reduce renderer-context compromise risk

Patch Information

ToDesktop has released a security advisory addressing this vulnerability. Organizations using ToDesktop Builder v0.33.0 should immediately consult the ToDesktop Security Advisory TDSA-2025-002 for specific patch instructions and updated versions. The ToDesktop Changelog provides additional information about security updates and version releases.

Workarounds

• Restrict custom URL scheme registrations to only essential protocols
• Implement additional validation layers for protocol handler invocations at the application level
• Enable strict context isolation in Electron webPreferences to minimize renderer-context attack surface
• Consider sandboxing ToDesktop Builder applications to limit the impact of successful exploitation