CVE-2026-28433: Misskey

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Misskey is an open source, federated social media platform. All Misskey servers running versions 10.93.0 and later, but prior to 2026.3.1, contain a vulnerability that allows importing other users' data due to lack of ownership validation. The impact of this vulnerability is estimated to be relatively low, as bad actors would require the ID corresponding to the target file for import. This vulnerability is fixed in 2026.3.1.

Affected products

• Misskey Misskey: from 10.93.0, before 2026.3.1 (fixed in 2026.3.1)

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