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

Advisories

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

severity: high
date: 7/27/2026
Affecting: siyuan >= 0, < 3.7.2
CVE: CVE-2026-66396
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 9.3
CVSS V4 Vector: 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
References: GitHub Security Advisory (GHSA-5rxg-wh59-mg34)
Credit: hypnguyen1209
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.

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