{"id":"GHSA-wwrj-3hvj-prpm","revision":null,"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":[]},{"revision":"9d8cb333e12b49e5a2daec7a07dfcc3c","observedAt":"2026-11-09T06:02:52.893+00:00","statement":{"source":"euvd","id":"EUVD-2025-203441","aliases":["CVE-2025-66482","GHSA-wwrj-3hvj-prpm"],"title":"Misskey is an open source, federated social media platform. 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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":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"references":["https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm","https://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-203441","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Dec 15, 2025, 11:18:37 PM","dateUpdated":"Dec 16, 2025, 3:09:19 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. 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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. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-66482","identifiers":["CVE-2025-66482"]},"retained":false,"historicalAffected":[]},{"revision":"e372ecc5e2a645fc8cef9e101b193546","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-wwrj-3hvj-prpm","aliases":["CVE-2025-66482"],"title":"Misskey has a login rate limit bypass via spoofed X-Forwarded-For header","description":"### Summary\nWhen using an untrusted reverse proxy or not using a reverse proxy at all, attackers 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, making it still vulnerable if the configuration is not set correctly.\n\n### Workaround\n\nIf you are running Misskey with a trusted reverse proxy, you should *not* be affected by this vulnerability.\n\n- There is no workaround for the Misskey itself. Please update Misskey to the latest version or set up a trusted reverse proxy.\n- From v2025.9.1 to v2025.11.1, workaround is available. Set `trustProxy: false` in config file.\n- This is patched in v2025.12.0 by flipping default value of `trustProxy` to `false`. If you are using trusted reverse proxy and not remember you manually overrided this value, please take time to check your config for optimal behavior.\n\n### Details\n[Fastify recommend not trusting X-Forwarded-For IPs](https://fastify.dev/docs/latest/Reference/Server/#trustproxy)\nDue to misconfiguration in https://github.com/misskey-dev/misskey/blob/develop/packages/backend/src/server/api/SigninApiService.ts#L94 attacks can spoof their IPs.\n\n### PoC\n\n```\nPOST /api/signin-flow HTTP/1.1\nHost: misskey.localhost:3123\nContent-Length: 45\nContent-Type: application/json\nConnection: keep-alive\nX-Forwarded-For: 127.1.1.31, 1.1.1.12\n\n{\"username\":\"admin\",\n\t\"password\":\"password\"}\n```\n![image](https://github.com/user-attachments/assets/ce9f77e2-b339-4081-86a6-d44ed42e9ca5)\n\n\n### Impact\nAn attacker can brute force accounts bypassing rate limiting protection.","state":0,"publishedAt":"2025-12-15T20:59:59+00:00","modifiedAt":"2026-02-03T03:16:38.620107+00:00","affected":[{"ecosystem":"npm","name":"misskey-js","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2025.9.1"},{"kind":"fixed","version":"2025.12.0-alpha.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","score":null,"severity":null},{"system":"CVSS_V4","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":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm","https://nvd.nist.gov/vuln/detail/CVE-2025-66482","https://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7","https://github.com/misskey-dev/misskey"],"sourceUrl":"https://github.com/advisories/GHSA-wwrj-3hvj-prpm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-wwrj-3hvj-prpm","identifiers":["GHSA-wwrj-3hvj-prpm","CVE-2025-66482"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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