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SiYuan CVE-2026-72802

| EUVDEUVD-2026-57462 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-08-12 VulnCheck GHSA-72xp-24p9-7vpf
Information Disclosure Authentication Bypass Siyuan
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
5.3 MEDIUM

Network-reachable endpoint bypasses authentication via CheckAuth gap (PR:N); impact is low confidentiality only, no integrity or availability loss.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 12, 2026 - 20:14 vuln.today
Patch available
Aug 12, 2026 - 20:03 EUVD

DescriptionCVE.org

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the resolveAssetPath endpoint that returns absolute filesystem paths unmodified to CheckAuth-only requests. Attackers can harvest relative asset paths from published documents and submit them to resolveAssetPath to obtain the server's absolute workspace path, disclosing the operating-system username and installation layout.

AnalysisAI

Information disclosure in SiYuan before v3.7.4 allows unauthenticated remote attackers to retrieve the server's absolute filesystem workspace path, operating-system username, and installation layout by querying the resolveAssetPath endpoint with relative asset paths harvested from published documents. The endpoint enforces only a lightweight CheckAuth gate rather than full authentication, satisfying CWE-639's authorization bypass pattern, and returns raw absolute paths to any network-reachable caller. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Locate network-accessible SiYuan with published documents
Delivery
Parse published document markup for relative asset paths
Exploit
Submit relative path to unauthenticated resolveAssetPath endpoint
Execution
Receive absolute filesystem path in HTTP response
Impact
Extract OS username and workspace installation layout
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the SiYuan instance is reachable over a network - not bound exclusively to localhost or isolated behind a VPN or firewall. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 with vector AV:N/AC:L/AT:N/PR:N/UI:N correctly reflects a low-complexity, unauthenticated, network-accessible vulnerability, while the impact metrics VC:L/VI:N/VA:N bound the consequence to partial confidentiality loss with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker locates a network-accessible SiYuan instance with at least one publicly published document, then parses the document markup to collect relative asset path references. The attacker submits those paths to the resolveAssetPath endpoint without valid credentials, and the server returns absolute filesystem paths that reveal the OS username and workspace directory structure. …
Remediation The primary remediation is to upgrade SiYuan to version 3.7.4 or later; the vendor-released patch is documented in the GitHub security advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jv8v-xq2h-657v. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-72802 vulnerability details – vuln.today
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