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.

Problem type

Affected products

misskey-dev

misskey

>= 10.93.0, < 2026.3.1 - AFFECTED

References

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

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

x_refsource_CONFIRM

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-28433

Click to expand

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    "dateUpdated": "2026-03-09T21:21:06.403Z",
    "dateReserved": "2026-02-27T15:54:05.138Z",
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              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
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