What is CVE-2026-45375?

CVE-2026-45375 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-05-14.

How severe is CVE-2026-45375?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Siyuan-note Siyuan

CVE-2026-45375

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan's Bazaar (community marketplace) renders the name and version fields of a package's plugin.json (and the equivalent theme.json / template.json / widget.j…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (3.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Siyuan-note Siyuan — versions <= 3.6.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-116 — Improper Encoding or Escaping of Output

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-45375?: CVE-2026-45375 is a critical-severity vulnerability in Siyuan-note Siyuan, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-05-14.
How severe is CVE-2026-45375?: Critical severity. CVSS v3 base score is 9.0 out of 10.