CVE-2026-25539

Published February 4th, 2026

View on NVD ↗

CVSS v3

9.1

CRITICAL

CVSS v2

N/A

Affected

PROJECT

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.

siyuan-note/siyuan

A privacy-first, self-hosted, fully open source personal knowledge management software, written in typescript and golang.

GitHub

44.4K