CVE-2026-28431

· HIGHAnalyzed

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CVSS v3.1

7.5

CVSS v4.0

9.2

EPSS

0.25%

Published

Mar 10, 2026

Modified

Mar 13, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

Misskey is an open source, federated social media platform. All Misskey servers running versions 8.45.0 and later, but prior to 2026.3.1, contain a vulnerability that allows bad actors access to data that they ordinarily wouldn't be able to access due to insufficient permission checks and proper input validation. This vulnerability occurs regardless of whether federation is enabled or not. This vulnerability could lead to a significant data breach. This vulnerability is fixed in 2026.3.1.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-285

Affected Products (1)

misskey · misskey (up to 2026.3.1)vulnerable

References (1)

https://github.com/misskey-dev/misskey/security/advisories/GHSA-r33c-qg3g-v9cr

Vendor Advisory

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