CVE-2026-86326 Security feature bypass in MGate MB3170 Series
Attackers with high privileges can bypass firmware signature checks to install malicious images, enabling persistent code execution on Moxa industrial gateways.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86326?
CVE-2026-86326 is a high-severity vulnerability in Moxa MGate MB3170 Series, published on 2 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
An improper verification of cryptographic signature vulnerability exists in protocol gateways because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates.
Weakness: CWE-347
Which versions are affected by CVE-2026-86326?
How do I fix CVE-2026-86326?
No fix has been published for CVE-2026-86326 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-86326 being exploited?
There is no known exploitation of CVE-2026-86326 in the wild and no public exploit code.
Sources
Also known as GHSA-pccp-468g-6mp8.