CVE-2026-28433

Misskey lacks resource ownership validation

State: Published
Severity: 2.3 Low
Published: Mar 9, 2026
Updated: Mar 10, 2026
Reserved: Feb 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	2.3 Low	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key
CWE-862 Missing Authorization

Affected Products

Product	Versions
misskeymisskey-dev	>= 10.93.0, < 2026.3.1Affected

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-g6hj-33h7-6fq8

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