PT-2026-67403 · Siyuan Note · Siyuan

Shirshakhtml · CVE-2026-68586 · Published 2026-08-03 · Updated 2026-08-03

Mitre

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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).

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-68586

Affected Products

Siyuan

References · 3

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-36v8-mpjm-8j5r · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-68586 · Security Note
• https://vulncheck.com/advisories/siyuan-before-content-disclosure-via-getbacklinkdoc · Note