Executive brief
Quest Bot is an open-source Discord bot used for server moderation and utility tasks. A security flaw allows any regular server member to access administrative moderation commands, such as adding or removing automated message filters. An attacker could use this to disrupt server operations by deleting legitimate messages from other users or disabling existing security protections.
Technical details
A missing authorization vulnerability (CWE-862) exists in Quest Bot's AutoMod slash commands. The /automod add, /automod remove, and /automod list commands lack both Discord default permission requirements and manual runtime checks for moderator privileges. This allows any authenticated guild member with slash command access to modify the bot's moderation rules. By adding broad rules (e.g., a single common letter), an attacker can trigger the bot to delete all messages containing that character, effectively causing a denial of service for server communications. The vulnerability is addressed in version 1.0.1 by implementing proper permission checks.
Affected products
- duck-organization Quest Bot < 1.0.1
Timeline
- 2026-05-17: patched: Version 1.0.1 released
- 2026-06-11: disclosed: CVE-2026-47163 published