What’s Vulnerable › Vulnerabilities

CVE-2026-23850: SiYuan vulnerable to arbitrary file read

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-19 · updated 2026-06-17
• Weakness: CWE-22

Description

SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.

Affected products

• siyuan-note siyuan: before 3.5.4 — fixed in 3.5.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.5.4. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/blob/master/kernel/model/file.go#L1035
• https://github.com/siyuan-note/siyuan/blob/v3.4.2/kernel/api/filetree.go#L799-L886
• https://github.com/siyuan-note/siyuan/commit/b2274baba2e11c8cf8901b0c5c871e5b27f1f6dd
• https://github.com/siyuan-note/siyuan/commit/f8f4b517077b92c90c0d7b51ac11be1b34b273ad
• https://github.com/siyuan-note/siyuan/issues/16860
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cv54-7wv7-qxcw

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