CVE-2026-46713: Misskey-Dev Misskey

Critical severity, CVSS 9.2. EPSS: 0.3% chance of exploitation in the next 30 days.

Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.

Affected products

• Misskey-Dev Misskey: from 12.37.0, before 2026.5.4 (fixed in 2026.5.4)

Published 2026-08-03. Last modified 2026-09-08.