Vulnerability · Published Aug 3, 2026 · Assigned by VulnCheck

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

High 8.6

In plain English

A high-severity missing authorization in siyuan from siyuan-note. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.4%top 64.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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).

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260721014413-f45749a7ef6e	GHSA-36v8-mpjm-8j5r
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260721014413-f45749a7ef6e	GO-2026-6379

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.7.3

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-36v8-mpjm-8j5r) vendor-advisory
VulnCheck Advisory: SiYuan before v3.7.3 Content Disclosure via getBacklinkDoc third-party-advisory