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CVE-2026-68586— SiYuan before v3.7.3 Content Disclosure via getBacklinkDoc

Quick assessment

Affected
siyuan-note siyuan
Exploitation
Public or AI PoC available; prioritize validation
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 3.7.3之前版本存在授权问题漏洞，该漏洞源于未对getBacklinkDoc和getBackmentionDoc内容端点（/api/ref/getBacklinkDoc和/api/ref/getBackmentionDoc）应用发布访问过滤器，可能导致发布模式读者（包括匿名读者）直接调用这些端点，检索被禁止发布文档的渲染DOM内容，并判断文档是否引用给定块。

CVSS 8.6 · High EPSS 0.41% · P32

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.3 affected
3.7.3 unaffected
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I. Basic Information for CVE-2026-68586

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.3 Content Disclosure via getBacklinkDoc
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.7.3 fails to apply publish-access filters to the getBacklinkDoc and getBackmentionDoc content endpoints (/api/ref/getBacklinkDoc and /api/ref/getBackmentionDoc). While the corresponding backlink list endpoints filter publish-forbidden documents, the content endpoints (gated only by CheckAuth) do not. A publish-mode reader — including an anonymous reader when publish Basic Auth is disabled — can call these endpoints directly with a publish-forbidden document's ID to retrieve its rendered DOM content and to determine whether the document references a given block (a reference-existence oracle).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 授权问题漏洞
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 3.7.3之前版本存在授权问题漏洞，该漏洞源于未对getBacklinkDoc和getBackmentionDoc内容端点（/api/ref/getBacklinkDoc和/api/ref/getBackmentionDoc）应用发布访问过滤器，可能导致发布模式读者（包括匿名读者）直接调用这些端点，检索被禁止发布文档的渲染DOM内容，并判断文档是否引用给定块。
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 ~ 3.7.3 -

II. Public POCs for CVE-2026-68586

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9862 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-68586

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Vendor Advisories for CVE-2026-68586 (2)

Same Patch Batch · siyuan-note · 2026-08-03 · 8 CVEs total

CVE-2026-69083 10.0 CRITICAL SiYuan before v3.7.3 SQL Injection via fullTextSearchAssetContent
CVE-2026-69085 10.0 CRITICAL SiYuan before v3.7.3 SQL Injection via searchDocs
CVE-2026-69084 10.0 CRITICAL SiYuan before v3.7.3 SQL Injection via searchEmbedBlock
CVE-2026-68587 8.6 HIGH SiYuan before v3.7.3 Information Disclosure via getHeading*Transaction
CVE-2026-68584 8.6 HIGH SiYuan before v3.7.3 Authentication Bypass via Content Endpoints
CVE-2026-69086 7.7 HIGH SiYuan before v3.7.3 Path Traversal via unvalidated avID
CVE-2026-68585 5.8 MEDIUM SiYuan before v3.7.3 Metadata Disclosure via getBlockInfo

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-862

V. Comments for CVE-2026-68586

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