CVE-2026-66395
CRITICALSiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol
Title source: cnaDescription
SiYuan desktop before v3.7.2 contains a reflected cross-site scripting vulnerability in the bazaar plugin readme handler that allows attackers to execute arbitrary code by crafting a malicious siyuan:// deep link. Attackers can inject HTML payloads via the plugin name parameter that execute with full Node.js access through insertAdjacentHTML rendering in an insecurely configured Electron renderer.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-6gx2-8gcr-x83f)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6gx2-8gcr-x83f
Third Party Advisory third-party-advisory
VulnCheck Advisory: SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol
https://www.vulncheck.com/advisories/siyuan-desktop-before-reflected-xss-to-rce-via-siyuan-protocol
Scores
CVSS v3
9.6
EPSS
0.0033
EPSS Percentile
25.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-79
Status
published
Products (2)
siyuan-note/siyuan
< 3.7.2
siyuan-note/siyuan
3.7.2
Published
Jul 27, 2026
Tracked Since
Jul 27, 2026