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CVE-2026-66396

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

CVSS 4.0 9.3 CRITICALCVSS 3.1 8.4 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-66396

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-66396

Published

siyuan

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "siyuan-note",
                    "product": "siyuan",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:golang/github.com/siyuan-note/siyuan",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "3.7.2"
                        },
                        {
                            "version": "3.7.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON