CVE-2026-66396
HIGHSiYuan before v3.7.2 Stored XSS to RCE via title-img IAL
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-5rxg-wh59-mg34)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
Third Party Advisory third-party-advisory
VulnCheck Advisory: SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL
https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial
Scores
CVSS v3
8.4
EPSS
0.0030
EPSS Percentile
21.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/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