Vulnerabilities CVE-2026-74902

CVE-2026-74902

Critical

Open

TLP:CLEAR

SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload

NVD CVE.org

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Description

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.

Details

CVSS Score: 9.3
CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Confidence: 90%
Published: Aug 18, 2026
Last Modified: Aug 18, 2026

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