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CVE-2026-46712— Misskey: Lack of proper permission checks in Direct Messaging feature

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-dev misskey是misskey-dev公司的一个去中心化的社交网络服务器软件。 misskey-dev misskey 2025.3.2版本至2026.5.4之前版本存在授权问题漏洞，该漏洞源于缺少适当的权限检查，可能导致未授权访问Direct Messages（原Chat）功能的某些数据点。

CVSS 2.3 · Low EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
misskey-dev misskey >= 2025.3.2, < 2026.5.4 affected
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I. Basic Information for CVE-2026-46712

Vulnerability Information
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Vulnerability Title
Misskey: Lack of proper permission checks in Direct Messaging feature
Source: CVE Program / CVE List V5
Vulnerability Description
Misskey is an open source, federated social media platform. Versions 2025.3.2 and later, but prior to 2026.5.4, contain a vulnerability where a lack of proper permission checks allows access to certain data points from the Direct Messages (formerly Chat) feature, regardless of account permissions. This vulnerability occurs whether or not federation is enabled. Notes created with "specified" visibility (formerly "direct" visibility) are not affected. This issue has been fixed in version 2026.5.4.
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-dev misskey 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
misskey-dev misskey是misskey-dev公司的一个去中心化的社交网络服务器软件。 misskey-dev misskey 2025.3.2版本至2026.5.4之前版本存在授权问题漏洞，该漏洞源于缺少适当的权限检查，可能导致未授权访问Direct Messages（原Chat）功能的某些数据点。
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 >= 2025.3.2, < 2026.5.4 -

II. Public POCs for CVE-2026-46712

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III. Intelligence Information for CVE-2026-46712

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Vendor Advisories for CVE-2026-46712 (1)

Vendor Pages for CVE-2026-46712 (1)

Same Patch Batch · misskey-dev · 2026-08-03 · 5 CVEs total

CVE-2026-46713 9.2 CRITICAL Misskey: JSON-LD signature validation + compaction may lead to improper activity handling
CVE-2026-47746 8.9 HIGH Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks
CVE-2026-48115 6.3 MEDIUM Misskey: Improper Authorization in the Announcements API
CVE-2026-46714 5.1 MEDIUM Misskey: Denial of Service via Uncontrolled Recursion in Theme Compilation

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-46712

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