CVE-2026-46712: CWE-639: Authorization Bypass Through User-Controlled Key in misskey-dev misskey
Misskey versions from 2025.3.2 up to but not including 2026.5.4 contain an authorization bypass vulnerability in the Direct Messages feature. This flaw allows access to certain data points without proper permission checks, regardless of account permissions or federation settings. Notes with specified (formerly direct) visibility are not affected. The issue is fixed in version 2026.5.4.
AI Analysis
Technical Summary
Misskey, an open source federated social media platform, has an authorization bypass vulnerability (CWE-639) in versions >=2025.3.2 <2026.5.4. The vulnerability allows unauthorized access to some Direct Messages data due to missing permission checks. This bypass applies regardless of federation being enabled or not. Notes created with specified visibility are unaffected. The vulnerability has been resolved in version 2026.5.4.
Potential Impact
Unauthorized users with limited privileges may access certain data points within the Direct Messages feature that should be restricted. This could lead to privacy violations but does not affect notes with specified visibility. The CVSS 4.0 score is low (2.3), indicating limited impact and exploitability.
Mitigation Recommendations
Upgrade to Misskey version 2026.5.4 or later to apply the official fix. There is no indication of temporary workarounds or partial mitigations. Patch status is confirmed by the vendor advisory stating the issue is fixed in 2026.5.4.
CVE-2026-46712: CWE-639: Authorization Bypass Through User-Controlled Key in misskey-dev misskey
Description
Misskey versions from 2025.3.2 up to but not including 2026.5.4 contain an authorization bypass vulnerability in the Direct Messages feature. This flaw allows access to certain data points without proper permission checks, regardless of account permissions or federation settings. Notes with specified (formerly direct) visibility are not affected. The issue is fixed in version 2026.5.4.
CVSS v4.0
Score 2.3low
Affected software
misskey-dev
misskey
pkg:github/misskey-dev/misskeyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Misskey, an open source federated social media platform, has an authorization bypass vulnerability (CWE-639) in versions >=2025.3.2 <2026.5.4. The vulnerability allows unauthorized access to some Direct Messages data due to missing permission checks. This bypass applies regardless of federation being enabled or not. Notes created with specified visibility are unaffected. The vulnerability has been resolved in version 2026.5.4.
Potential Impact
Unauthorized users with limited privileges may access certain data points within the Direct Messages feature that should be restricted. This could lead to privacy violations but does not affect notes with specified visibility. The CVSS 4.0 score is low (2.3), indicating limited impact and exploitability.
Mitigation Recommendations
Upgrade to Misskey version 2026.5.4 or later to apply the official fix. There is no indication of temporary workarounds or partial mitigations. Patch status is confirmed by the vendor advisory stating the issue is fixed in 2026.5.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-15T23:26:58.309Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a710cc4bf32cb7a3449086b
Added to database: 08/03/2026, 21:48:52 UTC
Last enriched: 08/11/2026, 18:22:48 UTC
Last updated: 09/17/2026, 22:01:35 UTC
Views: 49
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