CVE-2026-25539

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.

• CWE-22

• https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720febPatch
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9Exploit, Vendor Advisory
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9Exploit, Vendor Advisory

Published

Feb 4, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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