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CVE-2026-73630— SiYuan before v3.7.4 Information Disclosure via authFilePublishAccess

Quick assessment

Affected
siyuan-note siyuan
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.

SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在侧信道信息泄露漏洞，该漏洞源于/api/filetree/authFilePublishAccess端点仅通过CheckAuth认证且可匿名访问，未正确设置失败码，导致响应消息和Set-Cookie头在不同访问层级存在差异，攻击者可通过提交空密码请求区分文档状态，从而确认无权访问的文档存在并获取发布认证Cookie。

CVSS 5.8 · Medium EPSS 0.34% · P26

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-73630

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Information Disclosure via authFilePublishAccess
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在侧信道信息泄露漏洞，该漏洞源于/api/filetree/authFilePublishAccess端点仅通过CheckAuth认证且可匿名访问，未正确设置失败码，导致响应消息和Set-Cookie头在不同访问层级存在差异，攻击者可通过提交空密码请求区分文档状态，从而确认无权访问的文档存在并获取发布认证Cookie。
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
siyuan-note siyuan 0 ~ 3.7.4 -

II. Public POCs for CVE-2026-73630

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III. Intelligence Information for CVE-2026-73630

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Vendor Advisories for CVE-2026-73630 (2)

Same Patch Batch · siyuan-note · 2026-08-14 · 6 CVEs total

CVE-2026-72811 10.0 CRITICAL SiYuan before v3.7.4 SQL Injection via backlink search
CVE-2026-72810 8.6 HIGH SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket
CVE-2026-72812 6.5 MEDIUM SiYuan before v3.7.4 Missing Authorization via refreshBacklink
CVE-2026-73049 5.8 MEDIUM SiYuan before v3.7.4 Information Disclosure via getAttributeViewBacklinks
CVE-2026-73048 5.8 MEDIUM SiYuan before v3.7.4 Information Disclosure via getRefIDsByFileAnnotationID

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-203

V. Comments for CVE-2026-73630

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