by Kastro
Paper/Archive/CVE-2026-66395

CVE-2026-66395

siyuan-note siyuan — SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol

EPSS 0.6%public exploitCVSS 9.6
critical.is priorityof 100
48
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 47.0.470 × 209.4Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
siyuan< 3.7.23.7.2CNA

Scores by source

VulnCheck (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
VulnCheck (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/siyuan-note/siyuan/security/advisories/GHSA-6gx2-8gcr-x83fwriteupvulncheck.com/advisories/siyuan-desktop-before-reflected-xss-to-rce-via-siyuan-protocol