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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-wwrj-3hvj-prpm Misskey has a login rate limit bypass via spoofed X-Forwarded-For header
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 06 Jan 2026 19:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:-:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta16:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta21:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta22:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta23:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta24:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta25:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta26:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta27:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta28:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta29:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta30:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta31:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta32:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta33:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta34:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta35:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta36:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta37:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta38:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta39:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta40:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta41:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta42:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:beta43:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc10:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc11:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc4:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc5:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc6:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc7:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc8:*:*:*:*:*:*
cpe:2.3:a:misskey:misskey:13.0.0:rc9:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'}


Tue, 16 Dec 2025 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Misskey
Misskey misskey
Vendors & Products Misskey
Misskey misskey

Tue, 16 Dec 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 15 Dec 2025 23:30:00 +0000

Type Values Removed Values Added
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.
Title Misskey has a login rate limit bypass via spoofed X-Forwarded-For header
Weaknesses CWE-1188
CWE-307
References
Metrics cvssV4_0

{'score': 6.9, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-12-16T15:09:19.925Z

Reserved: 2025-12-02T17:09:52.016Z

Link: CVE-2025-66482

cve-icon Vulnrichment

Updated: 2025-12-16T14:37:29.779Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-16T00:16:02.503

Modified: 2026-01-06T19:41:47.383

Link: CVE-2025-66482

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-16T17:09:39Z

Weaknesses