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CVE-2026-3749— Bytedesk SVG File UploadRestService.java handleFileUpload unrestricted upload

Quick assessment

Affected
n/a Bytedesk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bytedesk是bytedesk.com个人开发者的一个全渠道智能客服平台。 Bytedesk 1.3.9及之前版本存在代码问题漏洞，该漏洞源于对文件UploadRestService.java中handleFileUpload函数的操作，可能导致无限制上传。

CVSS 6.3 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3749

Vulnerability Information
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Vulnerability Title
Bytedesk SVG File UploadRestService.java handleFileUpload unrestricted upload
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Bytedesk 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bytedesk是bytedesk.com个人开发者的一个全渠道智能客服平台。 Bytedesk 1.3.9及之前版本存在代码问题漏洞，该漏洞源于对文件UploadRestService.java中handleFileUpload函数的操作，可能导致无限制上传。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- Bytedesk 1.3.0 -

II. Public POCs for CVE-2026-3749

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III. Intelligence Information for CVE-2026-3749

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Patches & Fixes for CVE-2026-3749 (1)

Vendor Advisories for CVE-2026-3749 (1)

Proof of Concept for CVE-2026-3749 (1)

Vendor Pages for CVE-2026-3749 (2)

Other References for CVE-2026-3749 (1)

Same Patch Batch · n/a · 2026-03-08 · 10 CVEs total

CVE-2026-3787 7.0 HIGH UltraVNC Windows Service cryptbase.dll uncontrolled search path
CVE-2026-3789 6.3 MEDIUM Bytedesk SpringAIGiteeRestController SpringAIGiteeRestService.java getModels server-side r
CVE-2026-3788 6.3 MEDIUM Bytedesk SpringAIOpenrouterRestController SpringAIOpenrouterRestService.java getModels ser
CVE-2026-3786 6.3 MEDIUM EasyCMS Request Parameter RbacuserAction.class.php sql injection
CVE-2026-3785 6.3 MEDIUM EasyCMS Request Parameter RbacnodeAction.class.php sql injection
CVE-2026-3748 6.3 MEDIUM Bytedesk SVG File UploadRestController.java uploadFile unrestricted upload
CVE-2026-3731 5.3 MEDIUM libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds
CVE-2026-3750 4.7 MEDIUM ContiNew Admin Storage Management S3ClientFactory.java URI.create server-side request forg
CVE-2026-3714 4.7 MEDIUM OpenCart Incomplete Fix CVE-2024-36694 template.php save special elements used in a templa

IV. Related Vulnerabilities

Same product: Bytedesk
Same vendor: n/a
Same weakness: CWE-434

V. Comments for CVE-2026-3749

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