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CVE-2026-28433— Misskey lacks resource ownership validation

Quick assessment

Affected
misskey-dev misskey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Misskey是Misskey开源的一个永久免费的开源联合社交媒体平台。 Misskey 10.93.0版本至2026.3.1之前版本存在安全漏洞，该漏洞源于缺少所有权验证，可能导致导入其他用户数据。

AI Predicted 3.5 Difficulty: Moderate EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-28433

Vulnerability Information
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Vulnerability Title
Misskey lacks resource ownership validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Misskey 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Misskey是Misskey开源的一个永久免费的开源联合社交媒体平台。 Misskey 10.93.0版本至2026.3.1之前版本存在安全漏洞，该漏洞源于缺少所有权验证，可能导致导入其他用户数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
misskey-dev misskey >= 10.93.0, < 2026.3.1 -

II. Public POCs for CVE-2026-28433

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III. Intelligence Information for CVE-2026-28433

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Vendor Advisories for CVE-2026-28433 (1)

Same Patch Batch · misskey-dev · 2026-03-09 · 3 CVEs total

CVE-2026-28432 HTTP signature verification can be bypassed
CVE-2026-28431 Misskey lacks proper authorization checks and input validation

IV. Related Vulnerabilities

Same product: misskey
Same vendor: misskey-dev
Same weakness: CWE-639

V. Comments for CVE-2026-28433

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