CVE-2026-73630: Observable Discrepancy in siyuan-note siyuan
SiYuan before v3.7.4 contains an information disclosure vulnerability in the /api/filetree/authFilePublishAccess endpoint, which is registered with CheckAuth only and is reachable anonymously. The endpoint never sets a failure code, so its outcome is signalled entirely by the response message and by the presence of a Set-Cookie header, and these signals differ across access tiers. By submitting requests with an empty password for a candidate document identifier, an anonymous attacker can distinguish whether a document is public/nonexistent, password-protected, or exists at the hidden or forbidden tier, thereby confirming the existence of documents they are not permitted to access. Because hidden and forbidden entries store an empty password, such requests also cause the server to issue a publish-auth cookie for forbidden documents.
AI Analysis
Technical Summary
The vulnerability in SiYuan before v3.7.4 involves the /api/filetree/authFilePublishAccess endpoint, which is reachable without authentication and uses response message content and Set-Cookie headers to indicate access tier status. Because the endpoint does not return failure codes, an attacker can distinguish between public, nonexistent, password-protected, hidden, and forbidden documents by submitting requests with empty passwords for document identifiers. Hidden and forbidden documents store empty passwords, causing the server to issue publish-auth cookies for forbidden documents, thereby leaking information about document existence and access restrictions.
Potential Impact
An anonymous attacker can confirm the existence and access level of documents they are not authorized to access, including hidden and forbidden documents. This information disclosure can lead to privacy violations and unauthorized knowledge of protected content. The issuance of publish-auth cookies for forbidden documents may further facilitate unauthorized access attempts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict anonymous access to the /api/filetree/authFilePublishAccess endpoint or implement additional access controls to prevent information leakage.
CVE-2026-73630: Observable Discrepancy in siyuan-note siyuan
Description
SiYuan before v3.7.4 contains an information disclosure vulnerability in the /api/filetree/authFilePublishAccess endpoint, which is registered with CheckAuth only and is reachable anonymously. The endpoint never sets a failure code, so its outcome is signalled entirely by the response message and by the presence of a Set-Cookie header, and these signals differ across access tiers. By submitting requests with an empty password for a candidate document identifier, an anonymous attacker can distinguish whether a document is public/nonexistent, password-protected, or exists at the hidden or forbidden tier, thereby confirming the existence of documents they are not permitted to access. Because hidden and forbidden entries store an empty password, such requests also cause the server to issue a publish-auth cookie for forbidden documents.
CVSS v4.0
Score 6.9medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in SiYuan before v3.7.4 involves the /api/filetree/authFilePublishAccess endpoint, which is reachable without authentication and uses response message content and Set-Cookie headers to indicate access tier status. Because the endpoint does not return failure codes, an attacker can distinguish between public, nonexistent, password-protected, hidden, and forbidden documents by submitting requests with empty passwords for document identifiers. Hidden and forbidden documents store empty passwords, causing the server to issue publish-auth cookies for forbidden documents, thereby leaking information about document existence and access restrictions.
Potential Impact
An anonymous attacker can confirm the existence and access level of documents they are not authorized to access, including hidden and forbidden documents. This information disclosure can lead to privacy violations and unauthorized knowledge of protected content. The issuance of publish-auth cookies for forbidden documents may further facilitate unauthorized access attempts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict anonymous access to the /api/filetree/authFilePublishAccess endpoint or implement additional access controls to prevent information leakage.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-13T11:17:25.161Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7f0286bf8831d539fec923
Added to database: 08/14/2026, 11:56:54 UTC
Last enriched: 08/14/2026, 12:11:59 UTC
Last updated: 08/14/2026, 17:13:51 UTC
Views: 8
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