CVE-2026-28431
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Misskey
PublishedMar 10, 2026
First seenMar 10, 2026
Weakness typeCWE-285CWE-285
How to fix
Update
- misskey misskey2026.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| misskey misskey | 8.45.0 ≤ v < 2026.3.1 | 2026.3.1 |
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