{"id":"CVE-2026-74902","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74902","summary":"SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML.…","details":"SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML. Attackers can craft a malicious filename containing script payloads that execute with full OS command access when a user drags, drops, or pastes the file into the editor.","published":"2026-08-18T12:19:30.370","modified":"2026-08-18T12:19:30.370","cvss":{"score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/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/security/advisories/GHSA-jf56-jrhq-j2qp"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-malicious-filename-upload"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T12:19:30.370"}}