CVE-2026-86191: Authorization Bypass Through User-Controlled Key in siyuan-note siyuan
Description
SiYuan versions before 3.8.2 have an information disclosure vulnerability in the getAttributeViewKeysByID endpoint. This flaw allows users with publish reader privileges to enumerate private attribute view key definitions without proper verification of database visibility. As a result, attackers can retrieve complete key schemas, including sensitive field names and relation definitions from hidden databases. The vulnerability has a medium severity rating with a CVSS score of 5.3.
CVSS v4.0
Score 5.3medium
Affected software
siyuan-note
siyuan
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86191 describes an authorization bypass vulnerability in SiYuan note-taking software versions prior to 3.8.2. The vulnerability exists in the getAttributeViewKeysByID endpoint, which fails to verify parent database visibility before returning attribute view key definitions. This allows users with publish reader permissions to enumerate private key schemas, exposing sensitive field names and relation definitions from databases that should be hidden. The flaw is classified as an information disclosure issue with a medium severity impact.
Potential Impact
Attackers with publish reader privileges can access sensitive schema information from hidden databases, potentially exposing confidential attribute names and relational data structures. This unauthorized disclosure could aid further attacks or data leakage but does not directly allow modification or deletion of data.
Mitigation Recommendations
A fixed version is available: upgrade SiYuan to version 3.8.2 or later to remediate this vulnerability. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the versioning information provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-05T11:51:31.102Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9c0d21acd9273b49d97139
Added to database: 09/05/2026, 12:37:53 UTC
Last enriched: 09/15/2026, 00:51:06 UTC
Last updated: 10/20/2026, 18:48:24 UTC
Views: 73
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