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Vulnerability record · CVE-2026-66396 · published 27 July 2026

CVE-2026-66396: Cross-site scripting vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.54% · top 56.8% CWE-79 · Cross-site scripting Deferred
9.3CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34

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Source: NIST National Vulnerability Database (record CVE-2026-66396), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.