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SiYuan CVE-2026-93921

| EUVDEUVD-2026-83457 MEDIUM
Missing Authorization (CWE-862)
2026-09-18 VulnCheck GHSA-j5v6-qhh5-48r7
Authentication Bypass Siyuan Siyuan Note
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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
vuln.today AI
4.3 MEDIUM

Network-reachable endpoint (AV:N/AC:L) abused by an authenticated read-only token holder (PR:L), leaking only metadata (C:L; I:N/A:N) within the app boundary (S:U).

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Sep 18, 2026 - 23:51 vuln.today

DescriptionCVE.org

SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection.

AnalysisAI

SiYuan versions through 3.8.4 fail to enforce authorization on the getDynamicIcon endpoint, allowing authenticated attackers holding a read-only publish token to disclose metadata-such as block titles, names, aliases, and hierarchical paths-of restricted documents via a template injection triggered by type=8 requests. The flaw is rated medium severity (vendor CVSS 5.3, independent CVSS 3.1 5.3) and impacts confidentiality only; no public exploit or active exploitation has been identified at time of analysis.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to already hold a valid read-only publish token for the target SiYuan instance (PR:L), and to reach the getDynamicIcon API endpoint over the network (AV:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but limited-severity information-disclosure flaw, correctly rated medium (vendor CVSS 4.0 5.3). … 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 SiYuan to a version later than 3.8.4; consult the vendor advisory GHSA-whcx-xxqh-c838 for the exact patched release. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-93921 vulnerability details – vuln.today
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