{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93923","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-18T21:57:00.454Z","datePublished":"2026-09-18T23:12:09.139Z","dateUpdated":"2026-09-18T23:12:09.139Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-18T23:12:09.139Z"},"datePublic":"2026-09-18T00:00:00.000Z","title":"SiYuan through 3.8.4 Stored XSS via Heading Style Attribute","descriptions":[{"lang":"en","value":"SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","cweId":"CWE-79","type":"CWE"}]}],"affected":[{"vendor":"siyuan-note","product":"siyuan","packageName":"github.com/siyuan-note/siyuan/kernel","collectionURL":"https://pkg.go.dev","packageURL":"pkg:golang/github.com/siyuan-note/siyuan/kernel","defaultStatus":"unaffected","versions":[{"version":"0","lessThanOrEqual":"3.8.4","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*","versionEndIncluding":"3.8.4"}]}]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH"}}],"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-928g-4hfq-qwvx)"},{"url":"https://github.com/siyuan-note/siyuan","tags":["product"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76","tags":["technical-description"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133","tags":["technical-description"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194","tags":["technical-description"]},{"name":"VulnCheck Advisory: SiYuan through 3.8.4 Stored XSS via Heading Style Attribute","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute"}],"credits":[{"lang":"en","value":"EVIL0RD","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}