What is CVE-2026-54066?

CVE-2026-54066 is a high-severity vulnerability in Siyuan-note Siyuan, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-06-24.

How severe is CVE-2026-54066?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Siyuan-note Siyuan

CVE-2026-54066

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the patch for CVE-2026-41894 ("Path Traversal via Double URL Encoding") sanitized the /export/ route but the identical root cause remains in the /assets/*path r…

Vulnerability class: Path Traversal (Directory Traversal)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Siyuan-note Siyuan — versions < 3.7.0

Weakness classification (CWE)

CWE-22 — Path Traversal
CWE-23 — Relative Path Traversal
CWE-1188 — Initialization of a Resource with an Insecure Default

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-54066?: CVE-2026-54066 is a high-severity vulnerability in Siyuan-note Siyuan, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-06-24.
How severe is CVE-2026-54066?: High severity. CVSS v3 base score is 7.5 out of 10.