EUVD-2026-74835
GHSA-ghrq-8gf7-vmrq
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Reader authentication required (PR:L) over network; impact is confidentiality-only as private blocks are readable but not writable, with no scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.
AnalysisAI
Siyuan note-taking application before v3.8.2 leaks private block content to authenticated readers through two export/preview API endpoints that skip publish-access validation when resolving embedded block references. Any user holding reader-level credentials can craft requests to /api/export/preview or /api/lute/copyStdMarkdown referencing public documents whose embed queries target private, hidden, or publish-disabled blocks, receiving their full rendered content. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid reader-level authenticated session on the target Siyuan instance - unauthenticated access is insufficient (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N, score 7.1) accurately captures the threat model: low-complexity network exploitation by any authenticated reader with high confidentiality impact and no integrity or availability consequences. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Siyuan v3.8.2 or later, which introduces proper publish-access filtering in the embed block rendering pipeline for the affected endpoints. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Siyuan deployments and identify instances containing sensitive, private, or confidential content; assess the risk posture of each installation. …
Sign in for detailed remediation steps and compensating controls.
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