Misskey
CVE-2026-28433
MEDIUM
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
2DescriptionGitHub Advisory
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.
AnalysisAI
Misskey versions 10.93.0 through 2026.3.0 allow authenticated users to import arbitrary user data due to insufficient ownership validation, enabling attackers with knowledge of target file IDs to access other users' information. The vulnerability requires valid login credentials and knowledge of specific file identifiers, limiting its practical impact. …
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Vulnerability AssessmentAI
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Fixed in version 2026.3.1.. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …
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