Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| B3Log | Siyuan | < 3.5.4 |
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/commit/b2274baba2e11c8cf8901b0c5c871e5b27fPatch
- https://github.com/siyuan-note/siyuan/commit/f8f4b517077b92c90c0d7b51ac11be1b34bPatch
- https://github.com/siyuan-note/siyuan/issues/16860Issue TrackingPatch
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-94c7-g2fj-7682Vendor AdvisoryExploitPatch
FAQ
What is CVE-2026-23851?
CVE-2026-23851 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...
How severe is CVE-2026-23851?
CVE-2026-23851 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23851?
Check the references section above for vendor advisories and patch information. Affected products include: B3Log Siyuan.