CVE-2026-3749 Bytedesk SVG File UploadRestService.java handleFileUpload unrestricted upload
Remote attackers can upload malicious SVG files due to unrestricted upload in Bytedesk, potentially leading to code execution or other impacts.
- 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-2026-3749?
CVE-2026-3749 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 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.
Which versions are affected by CVE-2026-3749?
It affects 1 product.
Products include Bytedesk Bytedesk.
How do I fix CVE-2026-3749?
No fix has been published for CVE-2026-3749 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3749 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3749 exists.
Other vulnerabilities in Bytedesk
- CVE-2026-3748 Bytedesk SVG File UploadRestController.java uploadFile 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-995q-rmr5-rrmg.