Admin-level arbitrary file read via unchecked source paths
Published Jan 19, 2026 · Updated Jan 19, 2026
Path traversal in SiYuan before 3.5.4 allows remote authenticated users to read arbitrary server files through a file-copy API. The globalCopyFiles handler in kernel/api/file.go accepts srcs from JSON and copies each existing path into the workspace without restricting it to an authorized directory. The endpoint requires an authenticated, non-read-only administrator; copied files become retrievable workspace assets, exposing their contents.
Summary
What happened
Path traversal in SiYuan before 3.5.4 allows remote authenticated users to read arbitrary server files through a file-copy API. The globalCopyFiles handler in kernel/api/file.go accepts srcs from JSON and copies each existing path into the workspace without restricting it to an authorized directory. The endpoint requires an authenticated, non-read-only administrator; copied files become retrievable workspace assets, exposing their contents.
The record
- CVE
- CVE-2026-23851
- Published
- Jan 19, 2026
- Updated
- Jan 19, 2026
- Vendor
- SiYuan Note
- Product
- SiYuan
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 19, 2026CVE publishedPublication date reported by the CVE source.
- Jan 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.5.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-94c7-g2fj-7682 arbitrary-file-read proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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