What’s Vulnerable › Vulnerabilities
CVE-2026-28431: Misskey lacks proper authorization checks and input validation
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-10 · updated 2026-06-17
- Weakness: CWE-285
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.
Affected products
- misskey-dev misskey: from 8.45.0 before 2026.3.1 — fixed in 2026.3.1
How to fix
Upgrade to a fixed version: misskey-dev misskey 2026.3.1. Check the vendor advisory for mitigations.
References
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