CVE-2026-3748 Details
Description
A security flaw has been discovered in Bytedesk up to 1.3.9. This affects the function uploadFile of the file source-code/src/main/java/com/bytedesk/core/upload/UploadRestController.java of the component SVG File Handler. Performing a manipulation results in unrestricted upload. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.4.5.1 is able to mitigate this issue. The patch is named 975e39e4dd527596987559f56c5f9f973f64eff7. Upgrading the affected component is recommended.
A vulnerability exists in Bytedesk versions through 1.3.9, allowing unrestricted upload of SVG files via the authenticated endpoint POST /api/v1/upload/file. The server's file type validation permits image/svg+xml, but fails to sanitize the contents before storage. This flaw enables an attacker to upload a malicious SVG containing JavaScript, which is executed when the file is accessed, resulting in stored cross-site scripting. The vulnerability has been assigned CVE-2026-3748.
Users are advised to upgrade to Bytedesk version 1.4.5.1, which addresses this vulnerability. The update is available as a Docker image or as a downloadable zip file.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Bytedesk/bytedesk/ | [email protected] | Product |
| https://github.com/Bytedesk/bytedesk/commit/975e39e4dd527596987559f56c5f9f973f64eff7 | [email protected] | Patch |
| https://github.com/Bytedesk/bytedesk/issues/18 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/Bytedesk/bytedesk/issues/18#issue-3993448721 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/Bytedesk/bytedesk/issues/18#issuecomment-3976672973 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/Bytedesk/bytedesk/releases/tag/v1.4.5.1 | [email protected] | Release Notes |
| https://vuldb.com/?ctiid.349726 | [email protected] | Permissions Required |
| https://vuldb.com/?id.349726 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.768028 | [email protected] | Third Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
| CWE-284 | Improper Access Control | [email protected] |
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| bytedesk bytedesk | < 1.4.5.1 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 10, 2026 | Initial Analysis | [email protected] |
| Mar 8, 2026 | New CVE Received | [email protected] |