High severity8.6NVD Advisory· Published Aug 18, 2026

CVE-2026-74902

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.7.4

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-jf56-jrhq-j2qpnvd
www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-malicious-filename-uploadnvd

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