CVE-2022-39302 is an authorization vulnerability classified under CWE-863 affecting Ree6, a moderation bot commonly used in Discord servers for managing and automating moderation tasks. The flaw exists in versions of Ree6 prior to 1.9.9 and allows malicious server owners to create configurations, such as "Better-Audit-Logging," that specify a logging channel belonging to a different Discord server (guild) as the target for log messages. This bypasses intended raid and webhook protections by enabling log messages to be sent cross-server without proper authorization checks. An attacker can exploit this by crafting specially designed log messages that could be used to spam or distribute mass advertisements in the targeted external guild channels. This unauthorized cross-server communication undermines the integrity of the moderation bot’s logging functionality and can lead to abuse of trusted channels for spam or malicious content delivery. The vulnerability does not require known exploits in the wild and has been patched in version 1.9.9. No workarounds are currently available, making updating to the patched version the primary remediation step. The issue arises from incorrect authorization logic that fails to verify that the configured logging channel belongs to the same server as the bot’s configuration, allowing cross-server message injection.

For European organizations using Ree6 as part of their Discord server moderation infrastructure, this vulnerability could lead to unauthorized spam or advertisement messages being injected into their official or community channels. This can degrade the integrity and trustworthiness of communication channels, potentially damaging brand reputation and user trust. In environments where Discord servers are used for customer support, internal communications, or community engagement, such unauthorized messages could disrupt operations and lead to user dissatisfaction. Additionally, the bypass of raid and webhook protections could facilitate coordinated spam or phishing campaigns, increasing the risk of social engineering attacks. While the vulnerability does not directly compromise confidentiality or system availability, the integrity and reliability of communication channels are at risk. Organizations relying heavily on Discord for public or internal communications should be aware of the potential for reputational harm and operational disruption.

The primary mitigation is to upgrade all instances of Ree6 to version 1.9.9 or later, where the authorization flaw has been corrected. Since no workarounds exist, organizations should prioritize patching to prevent exploitation. Additionally, administrators should audit their current Ree6 configurations to ensure that logging channels are correctly set to channels within their own servers and not referencing external guild channels. Monitoring logs for unusual or unexpected log message activity, especially messages originating from external sources or containing spam-like content, can help detect exploitation attempts. Implementing Discord server-level controls such as restricting webhook creation permissions and limiting bot permissions to only necessary channels can reduce the attack surface. Educating server moderators about this vulnerability and encouraging vigilance against spam or unauthorized messages will further enhance resilience. Finally, organizations should maintain an inventory of Discord bots in use and ensure timely updates to avoid similar authorization issues.