CVE-2025-66482 (GCVE-0-2025-66482)
Vulnerability from cvelistv5
Published
2025-12-15 23:18
Modified
2025-12-16 15:09
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
  • CWE-1188 - Insecure Default Initialization of Resource
Summary
Misskey is an open source, federated social media platform. Attackers who use an untrusted reverse proxy or not using a reverse proxy at all can bypass IP rate limiting by adding a forged X-Forwarded-For header. Starting with version 2025.9.1, an option (`trustProxy`) has been added in config file to prevent this from happening. However, it is initialized with an insecure default value before version 2025.12.0-alpha.2, making it still vulnerable if the configuration is not set correctly. This is patched in v2025.12.0-alpha.2 by flipping default value of `trustProxy` to `false`. Users of a trusted reverse proxy who are unsure if they manually overode this value should check their config for optimal behavior. Users are running Misskey with a trusted reverse proxy should not be affected by this vulnerability. From v2025.9.1 to v2025.11.1, workaround is available. Set `trustProxy: false` in config file.
References
Impacted products
Vendor Product Version
misskey-dev misskey Version: >= 2025.9.1, < 2025.12.0-alpha.2
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