CVE•Published 2026-07-27•Modified 2026-07-28•1 article on news•4 live references•NVD data
CVE-2026-66394
Vulnerability data via NVD (ingested)
CVSS v3.1
8.7
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
EPSS percentile
—
Weaknesses (CWE)
Description
SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerabilities in SVG sanitization that allows authenticated attackers to execute scripts by bypassing the HTML parser-based cleaner. Attackers can hide script tags within desc, style, or noscript elements which the HTML parser treats as raw text but browsers interpret as executable SVG content when served as image/svg+xml, enabling script execution in the application origin.
Timeline
Published 2026-07-27
Modified 2026-07-28
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-66394Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-66394Censys host search filtered to this CVE id.
grep.app
CVE-2026-66394Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-66394GitHub code search for direct mentions.
Google dork
"CVE-2026-66394" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-66394 on GitHub.