CVE-2025-66402: Misskey

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Misskey is an open source, federated social media platform. Starting in version 13.0.0-beta.16 and prior to version 2025.12.0, an actor who does not have permission to view favorites or clips can can export the posts and view the contents. Version 2025.12.0 fixes the issue.

Affected products

• Misskey Misskey: from 13.1.0, before 2025.12.0 (fixed in 2025.12.0); version 13.0.0 only

Published 2025-12-16. Last modified 2026-06-17.