Categories
CVE-2026-25539

SiYuan has Arbitrary File Write via /api/file/copyFile leading to RCE

Summary

SiYuan has Arbitrary File Write via /api/file/copyFile leading to RCE

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

References

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