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VULNERABILITIES

CVE-2026-74902 Details

UNDERGOING ENRICHMENT

The CVE is currently being enriched by the Volerion team. The enrichment process results in the association of reference link tags, CVSS, and CPE applicability statement data.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NDDVolerionCVSS-B:…Vector:This vulnerability is currently being analyzed.
CNA: [email protected]CVSS-B:8.6 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf56-jrhq-j2qp [email protected]
https://www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-malicious-filename-upload [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')[email protected]

Affected Products

This vulnerability is currently being analyzed

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-74902
NVD Published Date:
Aug 18, 2026
NVD Last Modified:
Aug 26, 2026
Source:
[email protected]
CVE-2026-74902 Details - Not Deferred