Arbitrary file upload in Bytedesk
CVE-2026-3749
A weakness has been identified in Bytedesk up to 1.3.9. This vulnerability affects the function handleFileUpload of the file source-code/src/main/java/com/bytedesk/core/upload/UploadRestService.java of the component SVG File Handler. Execu…
EPSS: 0.001 (34.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Bytedesk
- N/a Bytedesk — versions 1.3.0, 1.3.1, 1.3.2
Weakness classification (CWE)
References
- VDB-349727 | Bytedesk SVG File UploadRestService.java handleFileUpload unrestricted upload (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-349727 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #768030 | Bytedesk <=1.3.9 Unrestricted Upload of File with Dangerous Type (CWE-434) (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (issue-tracking, Exploit, Vendor Advisory)
- cna@vuldb.com (issue-tracking, Exploit, Vendor Advisory)
- cna@vuldb.com (issue-tracking, Exploit, exploit, Vendor Advisory)
- cna@vuldb.com (Patch, patch)
- cna@vuldb.com (Release Notes, patch)
- cna@vuldb.com (Product, product)
Frequently asked questions
- What is CVE-2026-3749?
- CVE-2026-3749 is a medium-severity vulnerability in Bytedesk, classified under Improper Access Control. CVSS score: 6.3/10. Published 2026-03-08.
- How severe is CVE-2026-3749?
- Medium severity. CVSS v3 base score is 6.3 out of 10.