{"id":65521,"date":"2026-06-24T16:59:12","date_gmt":"2026-06-24T16:59:12","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=65521"},"modified":"2026-06-24T16:59:12","modified_gmt":"2026-06-24T16:59:12","slug":"siyuan-stored-xss-to-rce-via-css-snippet-style-breakout-in-rendersnippet","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=65521","title":{"rendered":"SiYuan: Stored XSS to RCE via CSS-snippet <style> breakout in renderSnippet()_CVE-2026-54067"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, CSS snippet body containing \\u003c\/style\\u003e breaks out of its surrounding \\u003cstyle\\u003e tag when renderSnippet() interpolates it via insertAdjacentHTML. A payload like runs arbitrary JavaScript in the renderer. On Electron desktop builds the renderer runs with nodeIntegration:true, so require(&#8216;child_process&#8217;) is reachable from the injected handler and the XSS chains to host RCE. Snippets sync via the workspace repository, so an attacker with write access to any synced workspace plants the payload once and it fires on every device that pulls. The bug also bypasses the user&#8217;s enabledCSS \/ enabledJS separation. A user who turned enabledJS off was making a deliberate call not to run untrusted JavaScript; the CSS path runs it anyway. This vulnerability is fixed in 3.7.0.&#8221;,&#8221;published&#8221;:&#8221;2026-06-24T21:14:38.173Z&#8221;,&#8221;modified&#8221;:&#8221;2026-06-24T21:14:38.173Z&#8221;,&#8221;type&#8221;:&#8221;cve&#8221;,&#8221;title&#8221;:&#8221;SiYuan: Stored XSS to RCE via CSS-snippet \\u003cstyle\\u003e breakout in renderSnippet()&#8221;,&#8221;source&#8221;:&#8221;GitHub_M&#8221;,&#8221;references&#8221;:&#8221;https:\/\/github.com\/siyuan-note\/siyuan\/security\/advisories\/GHSA-mvjr-vv3c-w4qv&#8221;,&#8221;id&#8221;:&#8221;CVE-2026-54067&#8243;,&#8221;bulletinFamily&#8221;:&#8221;&#8221;,&#8221;cwe&#8221;:[&#8220;CWE-79&#8243;,&#8221;CWE-1188&#8243;],&#8221;cvelist&#8221;:null,&#8221;sourceData&#8221;:&#8221;siyuan-note siyuan \\u003c 3.7.0&#8243;,&#8221;sourceHref&#8221;:&#8221;&#8221;,&#8221;cvss&#8221;:{&#8220;score&#8221;:9.9,&#8221;severity&#8221;:&#8221;CRITICAL&#8221;,&#8221;vector&#8221;:&#8221;CVSS:3.1\/AV:N\/AC:L\/PR:L\/UI:N\/S:C\/C:H\/I:H\/A:H&#8221;,&#8221;version&#8221;:&#8221;3.1&#8243;},&#8221;cvss2&#8243;:{},&#8221;cvss3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;,&#8221;cvssV3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;}},&#8221;href&#8221;:&#8221;&#8221;,&#8221;category_name&#8221;:&#8221;CVE&#8221;,&#8221;post_link&#8221;:&#8221;&#8221;,&#8221;product&#8221;:&#8221;siyuan&#8221;,&#8221;version&#8221;:&#8221;\\u003c 3.7.0&#8243;,&#8221;vendor&#8221;:&#8221;siyuan-note&#8221;,&#8221;ai_description&#8221;:&#8221;Stored XSS to RCE via CSS-snippet \\u003cstyle\\u003e breakout in renderSnippet()&#8221;,&#8221;ai_severity&#8221;:&#8221;Critical&#8221;,&#8221;ai_vendor&#8221;:&#8221;siyuan-note&#8221;,&#8221;ai_product&#8221;:&#8221;SiYuan&#8221;,&#8221;ai_version&#8221;:&#8221;\\u003c 3.7.0&#8243;,&#8221;ai_score&#8221;:9.9}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, CSS snippet body containing \\u003c\/style\\u003e breaks out of its surrounding \\u003cstyle\\u003e tag when renderSnippet()&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[9,6,8,45,12,13,7,11,5],"class_list":["post-65521","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-critical","tag-cve","tag-cvss","tag-cvss-99","tag-exploit","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SiYuan: Stored XSS to RCE via CSS-snippet  breakout in renderSnippet()_CVE-2026-54067 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=65521\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SiYuan: Stored XSS to RCE via CSS-snippet  breakout in renderSnippet()_CVE-2026-54067 - zero redgem\" \/>\n<meta property=\"og:description\" content=\"{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;SiYuan is an open-source personal knowledge management system. 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