What is CVE-2026-54067?

CVE-2026-54067 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2026-06-24.

How severe is CVE-2026-54067?

Critical severity. CVSS v3 base score is 9.9 out of 10.

RCE in Siyuan-note Siyuan

CVE-2026-54067

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, CSS snippet body containing </style> breaks out of its surrounding <style> tag when renderSnippet() interpolates it via insertAdjacentHTML. A payload like runs…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Siyuan-note Siyuan — versions < 3.7.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-1188 — Initialization of a Resource with an Insecure Default

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-54067?: CVE-2026-54067 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2026-06-24.
How severe is CVE-2026-54067?: Critical severity. CVSS v3 base score is 9.9 out of 10.