{"id":"CVE-2025-66482","revision":"0ebcaf5ba5284f6b90ea5fa9da74743f","records":[{"revision":"0ebcaf5ba5284f6b90ea5fa9da74743f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-66482","aliases":[],"title":"Misskey has a login rate limit bypass via spoofed X-Forwarded-For header","description":"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.","state":0,"publishedAt":"2025-12-15T23:18:37.295+00:00","modifiedAt":"2025-12-16T15:09:19.925+00:00","affected":[{"ecosystem":"Vendor product","name":"misskey","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"misskey-dev\",\n                    \"product\": \"misskey\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2025.9.1, < 2025.12.0-alpha.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm","https://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-66482","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-66482","identifiers":["CVE-2025-66482"]},"retained":false,"historicalAffected":[]}],"coverage":[]}