CVE-2026-28433

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

Product

Misskey

PublishedMar 10, 2026

First seenMar 10, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key CWE-862Missing authorization

How to fix

Update

misskey misskey2026.3.1 or later

Affected products

Product	Affected versions	Fixed in
misskey misskey	10.93.0 ≤ v < 2026.3.1	2026.3.1

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