RCE in Misskey
CVE-2025-66482
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…
EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
Affected products
- Misskey — versions 13.0.0
- Misskey-dev Misskey — versions >= 2025.9.1, < 2025.12.0-alpha.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-66482?
- CVE-2025-66482 is a medium-severity vulnerability in Misskey, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2025-12-16.
- How severe is CVE-2025-66482?
- Medium severity. CVSS v3 base score is 6.5 out of 10.