EUVD-2026-71003
GHSA-gwmf-gvp9-fcc2
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
Network-accessible, low-complexity bypass requiring authenticated session (PR:L); confidentiality-only impact, no integrity or availability effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
SiYuan versions before v3.8.2 contain a path guard bypass vulnerability in the MCP file-access handler that uses case-sensitive matching on Linux filesystems. Attackers can read the protected publishAccess.json file by requesting case-variant paths like PublishAccess.json to disclose sensitive publish-access configuration and metadata.
AnalysisAI
Path guard bypass in SiYuan's MCP file-access handler exposes the protected publishAccess.json configuration file to authenticated low-privileged attackers on Linux deployments. The handler enforces access restrictions using case-sensitive string matching, but Linux filesystems are themselves case-sensitive - meaning an attacker requesting a case-variant path such as PublishAccess.json bypasses the guard while the filesystem resolves it to the same protected file. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated session at low-privilege level (PR:L per CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N) scores 7.1, accurately capturing a network-accessible, low-complexity confidentiality breach requiring only a low-privilege authenticated session. … 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 | Vendor-released patch: v3.8.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all SiYuan deployments on Linux systems running versions prior to v3.8.2 and assess which ones contain sensitive publishing credentials in configuration files. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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