FKIE_CVE-2025-66482

Vulnerability from fkie_nvd - Published: 2025-12-16 00:16 - Updated: 2026-01-06 19:41
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Summary
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.
References
security-advisories@github.comhttps://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7Patch
security-advisories@github.comhttps://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpmExploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpmExploit, Vendor Advisory
Impacted products
Vendor Product Version
misskey misskey *
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
misskey misskey 13.0.0
To clipboard 

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      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2025-66482",
  "lastModified": "2026-01-06T19:41:47.383",
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        "cvssData": {
          "attackComplexity": "LOW",
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          "attackVector": "NETWORK",
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          "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",
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          "vulnerabilityResponseEffort": "NOT_DEFINED"
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  "published": "2025-12-16T00:16:02.503",
  "references": [
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      "tags": [
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  "vulnStatus": "Analyzed",
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          "value": "CWE-307"
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          "lang": "en",
          "value": "CWE-1188"
        }
      ],
      "source": "security-advisories@github.com",
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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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