CVE-2026-48115: Misskey-Dev Misskey

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Misskey is an open source, federated social media platform. All Misskey servers running versions 2024.5.0 and later, but prior to 2026.5.4, contain a vulnerability in the Server Announcements API where insufficient permission checks allow attackers to access limited portions of data that they normally couldn't view. This vulnerability occurs whether or not federation is enabled. This issue has been fixed in version 2026.5.4.

Affected products

• Misskey-Dev Misskey: from 2024.5.0, before 2026.5.4 (fixed in 2026.5.4)

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