{"id":"CVE-2026-93923","aliases":["EUVD-2026-83459","GHSA-928g-4hfq-qwvx","GHSA-qvp6-cjg5-8753"],"status":"published","title":"SiYuan through 3.8.4 Stored XSS via Heading Style Attribute","description":"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.","severity":{"version":"4.0","score":8.6,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00599,"percentile":0.49115,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-09-18T23:12:09Z","modified":"2026-10-28T02:31:13Z","products":[{"vendor":"siyuan-note","product":"siyuan"}],"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx","tags":["vendor-advisory","exploit","advisory"]},{"url":"https://github.com/siyuan-note/siyuan","tags":["product","package"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76","tags":["technical-description","article"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133","tags":["technical-description","article"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194","tags":["technical-description","article"]},{"url":"https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93923","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qvp6-cjg5-8753"},{"url":"https://pkg.go.dev","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93923.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-93923","title":"SiYuan through 3.8.4 Stored XSS via Heading Style Attribute","description":"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.","status":"published","published":"2026-09-18T23:12:09.139Z","modified":"2026-09-21T15:39:08.068Z","cvss":[{"version":"4.0","score":8.6,"vector":"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","level":"high","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:54.122945Z"}],"euvd":[{"id":"EUVD-2026-83459","description":"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.","status":"published","published":"2026-09-18T23:12:09Z","modified":"2026-09-21T15:39:08Z","cvss":[{"version":"4.0","score":8.6,"vector":"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","level":"high"}],"updated_at":"2026-11-02T17:28:05.36994Z"}],"ghsa":[{"id":"GHSA-qvp6-cjg5-8753","title":"SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark...","description":"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.","status":"published","published":"2026-09-19T00:32:44Z","modified":"2026-09-19T00:32:50Z","cvss":[{"version":"4.0","score":8.6,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:12:12.782251Z"}],"nvd":[{"id":"CVE-2026-93923","description":"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.","status":"published","published":"2026-09-19T00:16:57.963Z","modified":"2026-09-21T16:17:28.387Z","cvss":[{"version":"4.0","score":8.6,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:50.043898Z"}],"osv":[{"id":"CVE-2026-93923","title":"SiYuan through 3.8.4 Stored XSS via Heading Style Attribute","description":"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.","status":"published","published":"2026-09-18T23:12:09.139Z","modified":"2026-10-28T02:31:13.893173703Z","cvss":[{"version":"4.0","score":8.6,"vector":"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","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:20.931171Z"}]}}