CRITICAL 9.3 NVD
CVE-2026-74902
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
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.
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf56-jrhq-j2qp
- https://www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-malicious-filename-uploa
This critical severity vulnerability with a CVSS score of 9.3 was published on 2026-08-18 via NVD.
Risk Timeline
CVE Disclosed2026-08-18 · -1 days ago
Remediation Resources
vulnfeed aggregates 11001 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.