CVE-2026-28431

HIGH
2026-03-10 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Mar 10, 2026 - 07:43 nvd
HIGH 7.5

Tags

Authentication Bypass Misskey

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.

Analysis

Misskey is an open source, federated social media platform.

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Remediation

Within 24 hours: Inventory all Misskey deployments and assess whether they are internet-facing or internally used; isolate critical instances if possible and review access logs for suspicious activity. Within 7 days: Implement network segmentation and access controls to limit Misskey exposure; establish monitoring for exploitation attempts; contact Misskey security team for patch timeline and subscribe to security advisories. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

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CVE-2026-28431 vulnerability details – vuln.today
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