CVE-2026-2459 Missing authorization in Relion REB500
Authenticated Installer users can access and modify unauthorized directories in Hitachi Energy Relion REB500 devices.
- 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-2026-2459?
CVE-2026-2459 is a high-severity missing authorization vulnerability in Hitachi Energy Relion REB500, published on 24 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability exists in REB500 for an authenticated user with Installer role to access and alter the contents of directories that the role is not authorized to do so.
Weakness: CWE-267
Which versions are affected by CVE-2026-2459?
It affects 1 product.
Products include Hitachienergy Reb500 Firmware.
How do I fix CVE-2026-2459?
No fix has been published for CVE-2026-2459 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-2026-2459 being exploited?
There is no known exploitation of CVE-2026-2459 in the wild and no public exploit code.
Other vulnerabilities in Hitachi Energy Relion REB500
Sources
Also known as GHSA-8hm4-jmvc-cfg9.