by Kastro
Paper/Archive/CVE-2026-68586

CVE-2026-68586

siyuan-note siyuan — SiYuan before v3.7.3 Content Disclosure via getBacklinkDoc

EPSS 0.4%CVSS 9.2
critical.is priorityof 100
35
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 35.2.352 × 207.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
siyuan< 3.7.33.7.3CNA

Scores by source

VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
VulnCheck (CNA)8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

advisorygithub.com/siyuan-note/siyuan/security/advisories/GHSA-36v8-mpjm-8j5rwriteupvulncheck.com/advisories/siyuan-before-content-disclosure-via-getbacklinkdoc