SiYuan Note up to 3.7.3 FilePublishAccess authFilePublishAccess ID information disclosure

Summaryinfo

A vulnerability categorized as problematic has been discovered in SiYuan Note SiYuan up to 3.7.3. Affected by this issue is some unknown functionality of the file /api/filetree/authFilePublishAccess of the component FilePublishAccess. The manipulation of the argument ID results in information disclosure. This vulnerability is identified as CVE-2026-73630. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in SiYuan Note SiYuan up to 3.7.3. Affected is an unknown functionality of the file /api/filetree/authFilePublishAccess of the component FilePublishAccess. The manipulation of the argument id with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-73630 since 08/13/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 3.7.4 eliminates this vulnerability.

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Productinfo

Vendor

• SiYuan Note

Name

• SiYuan

Version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3

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