CVE-2026-8067 Missing authorization in RTU500 series CMU firmware
An authenticated user can trigger a reboot of the RTU500 device via an unprotected reset endpoint, causing temporary service disruption.
- 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-2026-8067?
CVE-2026-8067 is a medium-severity missing authorization vulnerability in Hitachi Energy RTU500 series CMU firmware, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An improper authorization vulnerability in the end-of-life versions of RTU500’s web application allows an authenticated user to trigger the RTU500 to reboot through the reset endpoint. Successful exploitation could cause temporary device unavailability and disruption of its intended operation.
Weakness: CWE-862
Which versions are affected by CVE-2026-8067?
How do I fix CVE-2026-8067?
No fix has been published for CVE-2026-8067 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-8067 being exploited?
There is no known exploitation of CVE-2026-8067 in the wild and no public exploit code.
Sources
Also known as GHSA-8w27-w4qm-ch74.