CVE-2026-74902 [HIGH] – SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload vali

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.