Unrestricted File Upload Vulnerability in Bytedesk SVG File Handler
CVE-2026-3749

5.3MEDIUM

Key Information:

Vendor

Bytedesk

Status
Bytedesk
Vendor
CVE Published:
8 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3749?

A significant vulnerability has been discovered in Bytedesk, affecting versions up to 1.3.9. This weakness resides in the handleFileUpload function of the SVG File Handler, located in the UploadRestService.java file. Attackers can exploit this flaw to perform unrestricted uploads of dangerous file types, which may lead to system compromise. The vulnerability is executable remotely, making it particularly critical for users to address. A patch has been issued in version 1.4.5.1, specifically identified in commit 975e39e4dd527596987559f56c5f9f973f64eff7. Users are strongly encouraged to update their installations to mitigate potential risks.

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Deploy the Patch

Affected Version(s)

Bytedesk 1.3.0

Bytedesk 1.3.1

Bytedesk 1.3.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-3749 - Proof of Concept

References

https://vuldb.com/?id.349727
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349727
signaturepermissions-required
https://vuldb.com/?submit.768030
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ZAST.AI (VulDB User)
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