Java
CVE-2026-3749
LOW
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionCVE.org
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.
AnalysisAI
Unrestricted file upload in Bytedesk versions up to 1.3.9 allows authenticated remote attackers to upload arbitrary SVG files through the handleFileUpload function in UploadRestService.java. Public exploit code exists for this vulnerability, and attackers can leverage it to bypass file upload restrictions and potentially execute malicious content. Upgrade to version 1.4.5.1 or apply patch 975e39e4dd527596987559f56c5f9f973f64eff7 to remediate.
Technical ContextAI
Classified as CWE-284 (Improper Access Control). Affects Bytedesk. 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 975e39e4d
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today