CVE-2025-25306: Misskey

Critical severity, CVSS 9.3. EPSS: 0.2% chance of exploitation in the next 30 days.

Misskey is an open source, federated social media platform. The patch for CVE-2024-52591 did not sufficiently validate the relation between the `id` and `url` fields of ActivityPub objects. An attacker can forge an object where they claim authority in the `url` field even if the specific ActivityPub object type require authority in the `id` field. Version 2025.2.1 addresses the issue.

Affected products

• Misskey Misskey: before 2025.2.1 (fixed in 2025.2.1)

Published 2025-03-10. Last modified 2026-06-17.