What’s Vulnerable › Vulnerabilities

CVE-2026-109309: SiYuan v3.7.0 before v3.8.6 Arbitrary File Read via Plugin ResponseFile.Path

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-13
• Weakness: CWE-22

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.

Affected products

• siyuan-note siyuan: from 3.7.0 before 3.8.6 — fixed in 3.8.6

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.6. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/commit/c6494375ea40ee973f430f0e85d50f1862a30d81
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-phmw-4rgv-r4xv
• https://www.vulncheck.com/advisories/siyuan-3.7.0-before-3.8.6-arbitrary-file-read-via-plugin-responsefile-path

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