by Kastro
Paper/Archive/CVE-2026-66396

CVE-2026-66396

siyuan-note siyuan — SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL

EPSS 0.5%public exploitCVSS 9.3
critical.is priorityof 100
47
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 45.5.455 × 209.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.

Affected

ProductAffectedFixed inSource
siyuan< 3.7.23.7.2CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)8.4CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34writeupvulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial