SSH
CVE-2026-25539
CRITICAL
GHSA-c4jr-5q7w-f6r9
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
SiYuan is a personal knowledge management system. Prior to version 3.5.5, the /api/file/copyFile endpoint does not validate the dest parameter, allowing authenticated users to write files to arbitrary locations on the filesystem. This can lead to Remote Code Execution (RCE) by writing to sensitive locations such as cron jobs, SSH authorized_keys, or shell configuration files. This issue has been patched in version 3.5.5.
AnalysisAI
SiYuan knowledge management system prior to 3.5.5 has a path traversal in /api/file/copyFile allowing arbitrary file operations on the server.
Technical ContextAI
SiYuan < 3.5.5 has a CWE-22 path traversal in the /api/file/copyFile endpoint that allows authenticated users to copy files to/from arbitrary locations on the server.
RemediationAI
Update SiYuan to 3.5.5+.
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Same weakness CWE-22 – Path Traversal
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External POC / Exploit Code
Leaving vuln.today