CVE-2026-74902
SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | siyuan-note |
| Product | siyuan |
| Published | Aug 18, 2026 |
| Last Updated | Aug 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
siyuan-note / siyuan
0 < 3.7.4
References
Credits
🔍 alham-rizvi