CVE-2026-100639

SiYuan v3.8.3 fails to HTML-escape the data-subtype attribute when generating gutter-button markup app/src/protyle/gutter/button.ts, assigned via innerHTML in app/src/protyle/gutter/index.ts from content pasted as plain-text Markdown containing a Kramdown inline attribute list IAL. Because the...

EUVD-2026-87733

SiYuan v3.8.3 fails to HTML-escape the data-subtype attribute when generating gutter-button markup app/src/protyle/gutter/button.ts, assigned via innerHTML in app/src/protyle/gutter/index.ts from content pasted as plain-text Markdown containing a Kramdown inline attribute list IAL. Because the...

CVE-2026-100639

SiYuan v3.8.3 is vulnerable to a Cross-Site Scripting (XSS) flaw due to a failure to HTML-escape the data-subtype attribute during gutter-button markup generation. This occurs when content containing a Kramdown inline attribute list (IAL) is pasted as plain-text Markdown. The shared Lute renderer...