VULNERABILITY INTELLIGENCE

CVE-2026-25539

CVSS score9.1 CRITICAL
EPSS probability1.10%
CISA KEVNot currently listed
Published2026-02-04
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Description

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.

Weakness classification

  • security-advisories@github.com: CWE-22

Primary references