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Vulnerability Details CVE-2026-40922

SiYuan is an open-source personal knowledge management system. In versions 3.6.1 through 3.6.3, a prior fix for XSS in bazaar README rendering (incomplete fix for CVE-2026-33066) enabled the Lute HTML sanitizer, but the sanitizer does not block iframe tags, and its URL-prefix blocklist does not effectively filter srcdoc attributes which contain raw HTML rather than URLs. A malicious bazaar package author can include an iframe with a srcdoc attribute containing embedded scripts in their README. When other users view the package in SiYuan's marketplace UI, the payload executes in the Electron context with full application privileges, enabling arbitrary code execution on the user's machine. This issue has been fixed in version 3.6.4.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 19.9%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-40922
  • B3log » Siyuan » Version: Any
    cpe:2.3:a:b3log:siyuan:*


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