{"id":"CVE-2026-93923","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-93923","summary":"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…","details":"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.","published":"2026-09-19T00:16:57.963","modified":"2026-09-19T00:16:58.100","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/siyuan-note/siyuan"},{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133"},{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194"},{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76"},{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-19T00:16:58.100"}}