CVE-2026-28433: Misskey lacks resource ownership validation
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-28433?
CVE-2026-28433 is considered a high severity vulnerability due to its potential for unauthorized data access.
How do I fix CVE-2026-28433?
To fix CVE-2026-28433, you should upgrade your Misskey server to version 2026.3.1 or later.
What versions of Misskey are affected by CVE-2026-28433?
Misskey versions 10.93.0 through 2026.3.0 are affected by CVE-2026-28433.
What does CVE-2026-28433 exploit?
CVE-2026-28433 exploits a lack of resource ownership validation, allowing unauthorized access to other users' data.
Is there a workaround for CVE-2026-28433?
Currently, the only effective mitigation for CVE-2026-28433 is to upgrade to the patched version of Misskey.