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. Executing a manipulation can lead to unrestricted upload. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 1.4.5.1 is able to resolve this issue. This patch is called 975e39e4dd527596987559f56c5f9f973f64eff7. It is recommended to upgrade the affected component.
EPSS: 0.004 (34.7th 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
- cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
- cna@vuldb.com (VDB Entry, Third Party Advisory, 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.