What’s Vulnerable › Vulnerabilities

CVE-2026-23851: SiYuan Vulnerable to Arbitrary File Read via File Copy Functionality

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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. Versions prior to 3.5.4 contain a logic vulnerability in the /api/file/globalCopyFiles endpoint. The function allows authenticated users to copy files from any location on the server's filesystem into the application's workspace without proper path validation. The vulnerability exists in the api/file.go source code. The function globalCopyFiles accepts a list of source paths (srcs) from the JSON request body. While the code checks if the source file exists using filelock.IsExist(src), it fails to validate whether the source path resides within the authorized workspace directory. Version 3.5.4 patches 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/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-94c7-g2fj-7682

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