CVE-2026-109309 Details
Description
SiYuan v3.7.0 before v3.8.6 contains an absolute path traversal vulnerability in the kernel's private plugin HTTP server, which passes a kernel plugin handler's ResponseFile.Path to gin's Context.File without validation. Attackers supplying a malicious kernel plugin can return an absolute path to read any file readable by the SiYuan process, including the API token and conf.json.
An absolute path traversal vulnerability has been identified in SiYuan versions 3.7.0 prior to 3.8.6. This vulnerability exists in the kernel's private plugin HTTP server, which improperly validates file paths returned by kernel plugin handlers. As a result, attackers can exploit this flaw to read any file accessible by the SiYuan process, including sensitive files like the API token and configuration file (conf.json). The issue arises because the HTTP server passes the ResponseFile.Path directly to gin's Context.File without any validation, allowing malicious plugins to manipulate file access.
Users can upgrade to SiYuan version 3.8.6 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 12, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SiYuan | <= v3.8.5 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 12, 2026 | New CVE Received | [email protected] |