CVE-2025-66482

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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."}, {"lang": "es", "value": "Misskey es una plataforma de redes sociales de c\u00f3digo abierto y federada. Los atacantes que utilizan un proxy inverso no confiable o que no utilizan ning\u00fan proxy inverso pueden eludir la limitaci\u00f3n de velocidad de IP a\u00f1adiendo un encabezado X-Forwarded-For falsificado. A partir de la versi\u00f3n 2025.9.1, se ha a\u00f1adido una opci\u00f3n ('trustProxy') en el archivo de configuraci\u00f3n para evitar que esto suceda. Sin embargo, se inicializa con un valor predeterminado inseguro antes de la versi\u00f3n 2025.12.0-alpha.2, haci\u00e9ndolo a\u00fan vulnerable si la configuraci\u00f3n no se establece correctamente. Esto se corrige en la v2025.12.0-alpha.2 cambiando el valor predeterminado de 'trustProxy' a 'false'. Los usuarios de un proxy inverso confiable que no est\u00e9n seguros si anularon manualmente este valor deber\u00edan revisar su configuraci\u00f3n para un comportamiento \u00f3ptimo. Los usuarios que ejecutan Misskey con un proxy inverso confiable no deber\u00edan verse afectados por esta vulnerabilidad. Desde la v2025.9.1 hasta la v2025.11.1, una soluci\u00f3n alternativa est\u00e1 disponible. Establezca 'trustProxy: false' en el archivo de configuraci\u00f3n."}], "id": "CVE-2025-66482", "lastModified": "2026-10-14T13:10:00.187", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66482", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-12-16T14:37:27.348528Z", "version": "2.0.3"}}]}, "published": "2025-12-16T00:16:02.503", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-307"}, {"lang": "en", "value": "CWE-1188"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"created": "2025-12-16T17:09:39.067400+00:00", "updated": "2025-12-16T17:09:39.067426+00:00", "vendors": ["misskey", "misskey$PRODUCT$misskey"]}