CVE-2025-53943: VoidBot Privilege Escalation Vulnerability

CVE-2025-53943 Overview

CVE-2025-53943 is a broken access control vulnerability (CWE-863) in VoidBot Open-Source, a customizable Discord bot. Versions 0.0.1 through 0.8.1 fail to enforce permission checks on certain administrative commands. Any authenticated Discord user can execute privileged commands such as ban, kick, and shutdown without holding the required roles. Version 1.0.0 resolves the issue. The flaw allows low-privilege users to disrupt server operations, remove members, and terminate the bot process.

Critical Impact

Unprivileged Discord users can invoke administrative commands, leading to mass member removal, server disruption, and bot shutdown.

Affected Products

• VoidBot Open-Source 0.0.1 through 0.8.1
• Fixed in VoidBot Open-Source 1.0.0
• Discord servers running vulnerable VoidBot instances

Discovery Timeline

• 2025-07-16 - CVE-2025-53943 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-53943

Vulnerability Analysis

The vulnerability resides in the VoidBot command handler. The handler dispatches commands received through Discord message events but does not consistently validate the invoking user's roles or Discord permission flags before executing administrative actions. Commands such as ban, kick, and shutdown should be restricted to server administrators or moderators. Instead, the handler executes them for any user able to send a message to the bot.

This is a classic authorization flaw classified under CWE-863: Incorrect Authorization. The bot trusts the command name without cross-referencing the issuer's permission set against the command's required privilege level. Discord.js exposes permission utilities through the GuildMember.permissions and PermissionsBitField interfaces, but the vulnerable code paths bypass these checks. Refer to the Discord.js Permissions Guide for the intended enforcement model.

Root Cause

The command dispatcher does not gate sensitive handlers behind permission validation. Required role checks, ownership checks, or PermissionFlagsBits comparisons are missing or unreachable for the affected commands. Authorization is treated as implicit rather than explicitly enforced per command.

Attack Vector

An attacker with any membership in a Discord guild running a vulnerable VoidBot instance sends the administrative command as a normal chat message. The bot processes the request, invokes the underlying Discord API call with its own elevated bot token, and performs the action. Exploitation requires no special tooling, only message-send privileges in a channel the bot reads. The attack is network-based and requires low privileges. See the GitHub Security Advisory GHSA-6rr8-9c8q-m5rv for the maintainer's disclosure.

No verified public exploit code is available. The vulnerability mechanism can be described in prose: an attacker types the privileged command prefix followed by the command name and target user ID in a channel monitored by the bot.

Detection Methods for CVE-2025-53943

Indicators of Compromise

• Unexpected ban or kick audit log entries attributed to the VoidBot account targeting multiple members in a short interval.
• Bot process termination events correlating with shutdown command messages from non-administrator users.
• Discord audit log entries where the moderation action's initiator is the bot but the triggering user has no moderator role.

Detection Strategies

• Review Discord guild audit logs for moderation actions performed by the VoidBot account and correlate against the role of the user who issued the command.
• Enable command logging on the bot host and search for invocations of ban, kick, or shutdown originating from non-privileged user IDs.
• Inventory all running VoidBot Open-Source deployments and identify any instance reporting a version between 0.0.1 and 0.8.1.

Monitoring Recommendations

• Forward bot stdout, stderr, and Discord webhook audit events to a centralized log platform for retention and correlation.
• Alert on bursts of member removal events or repeated bot restart cycles, which indicate shutdown abuse.
• Track outbound Discord API calls from the bot host to detect anomalous moderation activity volume.

How to Mitigate CVE-2025-53943

Immediate Actions Required

• Upgrade VoidBot Open-Source to version 1.0.0 or later on every Discord server where it is deployed.
• Rotate the Discord bot token after upgrade to invalidate any session that may have been abused.
• Audit recent moderation actions and reverse unauthorized ban or kick events.

Patch Information

The maintainer fixed the issue in VoidBot Open-Source 1.0.0 by adding proper permission enforcement to the command handler. Upgrade details are documented in the GitHub Security Advisory GHSA-6rr8-9c8q-m5rv.

Workarounds

• Take the bot offline until the upgrade to 1.0.0 is complete if active exploitation is suspected.
• Restrict the channels where the bot listens for commands to administrator-only channels using Discord channel permissions.
• Reduce the bot's guild permissions to the minimum required, removing BAN_MEMBERS and KICK_MEMBERS if those features are not needed.

# Upgrade VoidBot Open-Source to the patched release
git fetch --tags
git checkout v1.0.0
npm install --production
pm2 restart voidbot