CVE-2026-3748 Bytedesk SVG File UploadRestController.java uploadFile unrestricted upload
Remote attackers can upload malicious SVG files via the uploadFile function, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3748?
CVE-2026-3748 is a medium-severity vulnerability in Bytedesk, published on 8 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-3748?
It affects 1 product.
Products include Bytedesk Bytedesk.
How do I fix CVE-2026-3748?
No fix has been published for CVE-2026-3748 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3748 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3748 exists.
Other vulnerabilities in Bytedesk
- CVE-2026-3749 Bytedesk SVG File UploadRestService.java handleFileUpload unrestricted upload
- CVE-2026-3788 Bytedesk SpringAIOpenrouterRestController SpringAIOpenrouterRestService.java getModels server-side request forgery
- CVE-2026-3789 Bytedesk SpringAIGiteeRestController SpringAIGiteeRestService.java getModels server-side request forgery
Sources
Also known as GHSA-x2c8-qgvg-23wq.