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CVE-2026-73053: SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji [CRITICAL] CVSS 9.4 Exploit Intelligence — Recent CVEs / 16h SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in the unicode2Emoji function that fails to sanitize codepoint branch output. Attackers can craft document icons with hex-encoded markup that executes in the renderer with Node integration enabled, achieving arbitrary code execution on the host system.

exploit-intel.com • August 16, 2026

SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in the unicode2Emoji function that fails to sanitize codepoint branch output. Attackers can craft document icons with hex-encoded markup that executes in the renderer with Node integration enabled, achieving arbitrary code execution on the host system.

Default status: unaffected

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Critical Stored XSS Vulnerabilities Found in SiYuan Versions Before 3.7.4 Two critical vulnerabilities, CVE-2026-73050 and CVE-2026-73052, have been identified in SiYuan versions prior to 3.7.4. CVE-2026-73050 allows attackers to exploit stored cross-site scripting (XSS) via unescaped color fields in select options, executing arbitrary JavaScript in victim browsers. CVE-2026-73052 enables similar attacks through unescaped attribute-view field names, potentially leading to arbitrary code execution on systems with Node integration enabled. Both vulnerabilities require authenticated access for exploitation, and no public proof-of-concept exploits are currently available. Users are advised to upgrade to version 3.7.4 or later to mitigate these risks. The vulnerabilities have been assigned a CVSS score of 9.4, indicating their critical nature. Security advisories have been released, urging immediate action to restrict access and review existing configurations. 3 sources 78

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