CVE-2025-41758 Arbitrary Write with wwwupload.cgi
A low-privileged remote attacker can exploit path traversal in wwupload.cgi to overwrite arbitrary files, leading to full system compromise on MBS UBR devices.
- 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-2025-41758?
CVE-2025-41758 is a high-severity path traversal vulnerability in MBS UBR-01 Mk II, published on 9 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A low-privileged remote attacker can exploit an arbitrary file write vulnerability in the wwupload.cgi endpoint. Due to path traversal this can lead to overwriting arbitrary files on the device and achieving a full system compromise.
Weakness: CWE-22
Which versions are affected by CVE-2025-41758?
It affects 1 product.
Products include Mbs-Solutions Universal Bacnet Router Firmware.
How do I fix CVE-2025-41758?
No fix has been published for CVE-2025-41758 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-41758 being exploited?
There is no known exploitation of CVE-2025-41758 in the wild and no public exploit code.
Other vulnerabilities in MBS UBR-01 Mk II
Sources
Also known as GHSA-c9g5-hpgh-47xr.