{"id":"EUVD-2025-203441","revision":"a8bc7dbe61554ee6b408ddd286e9c5d5","records":[{"revision":"a8bc7dbe61554ee6b408ddd286e9c5d5","observedAt":"2026-11-03T03:08:53.382+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. 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…","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":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. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2025-203441","identifiers":["EUVD-2025-203441","CVE-2025-66482","GHSA-wwrj-3hvj-prpm"]},"retained":false,"historicalAffected":[]}],"coverage":[]}