{"id":"EUVD-2025-203441","enisaUuid":"776a0b95-d8a2-3be6-bbf2-2a3f0b627ef1","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.","datePublished":"Dec 15, 2025, 11:18:37 PM","dateUpdated":"Dec 16, 2025, 3:09:19 PM","baseScore":6.9,"baseScoreVersion":"4.0","baseScoreVector":"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","references":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm\nhttps://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7\n","aliases":"CVE-2025-66482\nGHSA-wwrj-3hvj-prpm\n","assigner":"GitHub_M","epss":0.34,"enisaIdProduct":[{"id":"5936d07d-02c8-318a-836b-32c32402e1ee","product":{"name":"misskey","vendor":{"name":"misskey-dev"}},"product_version":"2025.9.1, \u003c 2025.12.0-alpha.2"}],"enisaIdVendor":[{"id":"44b2e613-9476-3147-80fb-7b96d65ed41c","vendor":{"name":"misskey-dev"}}],"enisaIdVulnerability":[{"id":"bc094cd2-14e6-30eb-9915-502488b105de","vulnerability":{"id":"GHSA-wwrj-3hvj-prpm","description":"Misskey has a login rate limit bypass via spoofed X-Forwarded-For header","datePublished":"Dec 15, 2025, 8:59:59 PM","dateUpdated":"Jan 6, 2026, 10:41:27 PM","baseScore":0.0,"references":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-66482\nhttps://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7\nhttps://github.com/misskey-dev/misskey\n","enisa_id":"EUVD-2025-203441\n","aliases":"GHSA-wwrj-3hvj-prpm\nCVE-2025-66482\n","epss":0.0,"dataProcessed":"Oct 25, 2026, 1:52:34 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"ee666641-d2a6-3db4-805b-983c1c972d93","vulnerability":{"id":"CVE-2025-66482","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.","datePublished":"Dec 15, 2025, 11:18:37 PM","dateUpdated":"Dec 16, 2025, 3:09:19 PM","status":"PUBLISHED","baseScore":6.9,"baseScoreVersion":"4.0","baseScoreVector":"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","references":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm\nhttps://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7\n","enisa_id":"EUVD-2025-203441\n","assigner":"GitHub_M","epss":0.34,"dataProcessed":"Oct 27, 2026, 7:20:58 AM","vulnerabilityProduct":[{"id":"a0b4d01e-24e0-38e5-b9a0-5bc2c600744e","product":{"name":"misskey","vendor":{"name":"misskey-dev"}},"product_version":"2025.9.1, \u003c 2025.12.0-alpha.2"}],"vulnerabilityVendor":[{"id":"3073df9a-b1b2-3932-a552-b12b9c2acded","vendor":{"name":"misskey-dev"}}]}}],"enisaIdAdvisory":[]}