CVE-2026-28800: Natro Macro Auth Bypass Vulnerability

CVE-2026-28800 Overview

CVE-2026-28800 is a Broken Access Control vulnerability affecting Natro Macro, an open-source Bee Swarm Simulator macro written in AutoHotkey. Prior to version 1.1.0, the Discord Remote Control feature, when configured in a non-private channel, allows any user with message-sending permissions in that channel to gain full control over the victim's computer. This includes the ability to send arbitrary keyboard and mouse inputs as well as complete file system access.

Critical Impact

Any Discord user with channel message permissions can gain complete computer control, including keyboard/mouse inputs and full file access, leading to potential data theft, malware installation, or system compromise.

Affected Products

• Natro Macro versions prior to 1.1.0
• natroteam natro_macro

Discovery Timeline

• 2026-03-06 - CVE CVE-2026-28800 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-28800

Vulnerability Analysis

This vulnerability stems from a fundamental access control flaw in how Natro Macro implements its Discord Remote Control feature. When users configure this functionality in a non-private Discord channel, the application fails to properly validate the identity and authorization of incoming commands. The lack of authentication means that any Discord user who can post messages in the configured channel can issue commands that the Natro Macro application will execute without verification.

The CWE-22 (Path Traversal) classification indicates that the file access component of this vulnerability may allow attackers to traverse directory structures and access files outside of intended boundaries, compounding the severity of the unauthorized access.

Root Cause

The root cause of this vulnerability lies in insufficient access control mechanisms within the Discord Remote Control feature. The application accepts and executes commands from any source within the configured Discord channel without implementing proper sender verification, authentication tokens, or authorization checks. This design oversight treats all channel participants as trusted entities capable of issuing privileged commands.

Attack Vector

The attack vector is network-based, requiring low privileges (channel message permissions) and user interaction (victim must have Discord Remote Control enabled in a non-private channel). An attacker can exploit this vulnerability by:

1. Identifying a Discord channel where a victim has Natro Macro's Remote Control feature enabled
2. Sending crafted messages to that channel containing commands
3. The victim's Natro Macro instance receives and executes these commands without validation
4. The attacker gains the ability to send keyboard/mouse inputs and access files on the victim's system

The vulnerability mechanism allows an attacker to send arbitrary commands through Discord messages that the Natro Macro application interprets and executes. Since no authentication or authorization checks are performed, any message that matches the command syntax will be processed, giving attackers full control over input devices and file system access. For complete technical details, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-28800

Indicators of Compromise

• Unexpected keyboard or mouse activity when the user is not actively using the computer
• Unusual file access patterns or file modifications occurring while Natro Macro is running
• Suspicious Discord messages containing command-like syntax in channels where Remote Control is enabled
• Unauthorized process executions or system configuration changes correlating with Discord activity

Detection Strategies

• Monitor for Natro Macro processes running alongside Discord with active network connections
• Implement behavioral analysis to detect automated input patterns inconsistent with normal user activity
• Review Discord channel configurations for Natro Macro Remote Control settings in non-private channels
• Audit file system access logs for unusual read/write operations when Natro Macro is active

Monitoring Recommendations

• Enable detailed logging for input device activity and correlate with Discord message timestamps
• Monitor AutoHotkey script execution patterns for unexpected command sequences
• Implement endpoint detection rules to flag unusual combinations of Discord communication and system control actions
• Review installed Natro Macro versions across the environment to identify vulnerable instances

How to Mitigate CVE-2026-28800

Immediate Actions Required

• Upgrade Natro Macro to version 1.1.0 or later immediately
• Disable the Discord Remote Control feature until the update is applied
• If Remote Control is required, ensure it is only configured in private Discord channels with trusted members
• Review recent file access and system activity logs for signs of unauthorized access

Patch Information

The vulnerability has been addressed in Natro Macro version 1.1.0. Users should update to this version or later to remediate the security issue. The patch implements proper access control mechanisms for the Discord Remote Control feature to prevent unauthorized command execution.

For detailed patch information and security guidance, see the GitHub Security Advisory.

Workarounds

• Disable the Discord Remote Control feature entirely in Natro Macro settings
• If Remote Control must be used, configure it only in private Discord channels with strictly controlled membership
• Implement network-level monitoring to detect and alert on suspicious Discord command patterns
• Consider running Natro Macro in a sandboxed environment to limit potential damage from exploitation

# Verify Natro Macro version (check installation directory)
# Ensure version is 1.1.0 or later
# Disable Remote Control in settings if running vulnerable version