CVE-2025-26604 Overview
CVE-2025-26604 affects Discord-Bot-Framework-Kernel, a Discord bot framework built on interactions.py that provides modular extension management. The framework permits arbitrary user-submitted code execution, which an authenticated privileged user can abuse to extract the bot token and load blocking modules. An attacker who obtains the token can impersonate the bot and perform actions against the Discord server. If the bot holds elevated privileges, the attacker gains near-complete control until the bot is removed. The issue is fixed in commit f0d9e70841a0e3170b88c4f8d562018ccd8e8b14.
Critical Impact
Attackers can exfiltrate the Discord bot token, impersonate the bot, and induce denial of service through blocking modules, resulting in loss of confidentiality, integrity, and availability across the hosted Discord environment.
Affected Products
- Discord-Bot-Framework-Kernel versions prior to commit f0d9e70841a0e3170b88c4f8d562018ccd8e8b14
- Any Discord bot deployment hosting the vulnerable Kernel framework
- Downstream extensions relying on the pre-patch module loader
Discovery Timeline
- 2025-02-18 - CVE-2025-26604 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-26604
Vulnerability Analysis
The framework accepts and executes user-submitted extension modules without a sandbox or restricted execution context. A privileged operator loading a crafted module can invoke commands that read process memory, environment variables, or configuration files containing the bot token. The weakness is categorized under [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor. Once the token is captured, the attacker instantiates a parallel client that authenticates as the legitimate bot, bypassing the Discord platform's identity boundary. A second-stage payload can register blocking synchronous code inside the event loop, halting message handling and causing a denial of service against the host bot.
Root Cause
The root cause is the absence of isolation around dynamically loaded extension modules. The framework treats submitted code as trusted and executes it with the same privileges as the bot process, granting access to the runtime token, network sockets, and file system. No allowlist, integrity check, or capability restriction gates the loader.
Attack Vector
Exploitation requires an actor with permission to load modules into the bot instance and user interaction to invoke the loaded command. The attacker submits a module that reads the bot token from memory or configuration, exfiltrates it over an outbound channel, and optionally loads a follow-on module that blocks the event loop. Because the vulnerability changes the security scope, the attacker's actions extend to the Discord workspace the bot serves.
See the GitHub Security Advisory GHSA-87jf-gf75-wwfm for technical details.
Detection Methods for CVE-2025-26604
Indicators of Compromise
- Unexpected outbound network connections from the bot process to non-Discord endpoints, indicating potential token exfiltration.
- Duplicate bot sessions or concurrent gateway connections observed in Discord audit logs using the same bot identity.
- New or unrecognized extension modules loaded into the Kernel runtime that were not deployed by the maintainer.
Detection Strategies
- Enable Discord audit log review for unusual bot actions such as role changes, mass message deletion, or permission edits performed outside normal operating hours.
- Monitor the bot host for spawn of child processes, file reads against configuration paths containing tokens, and reads of os.environ.
- Compare deployed module hashes against the maintainer's expected manifest to identify unauthorized extensions.
Monitoring Recommendations
- Alert on gateway IDENTIFY events originating from IP addresses that do not match the sanctioned bot host.
- Track event loop latency and command handler timeouts as signals of a blocking module attack.
- Log every module load call with the caller identity, source path, and timestamp for retrospective review.
How to Mitigate CVE-2025-26604
Immediate Actions Required
- Update Discord-Bot-Framework-Kernel to a revision at or beyond commit f0d9e70841a0e3170b88c4f8d562018ccd8e8b14.
- Rotate the Discord bot token through the Discord Developer Portal and invalidate any prior session.
- Audit currently loaded modules and remove any extension not authored or reviewed by the maintainer.
Patch Information
The fix is delivered in commit f0d9e70841a0e3170b88c4f8d562018ccd8e8b14. Operators must pull the updated repository state and redeploy the bot process. Refer to the GitHub Security Advisory GHSA-87jf-gf75-wwfm for the maintainer's guidance.
Workarounds
- Restrict the bot's Discord permissions to the minimum required intents and role scopes to reduce blast radius if the token is stolen.
- Limit which operators can load extension modules and require code review before any module is deployed to the running bot.
- Store the bot token outside the process environment when possible and load it through a secrets broker that logs each access.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
