Critical severity · published Jul 27, 2026
CVE-2026-66395
SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol
9.6
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.7.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66395
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66395
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6gx2-8gcr-x83f
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-desktop-before-reflected-xss-to-rce-via-siyuan-protocol
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