# CVE-2026-2460: Missing authorization in Relion REB500

> Authenticated low-privilege users can bypass authorization to access and modify unauthorized directories via the DAC protocol in Hitachi Energy Relion REB500.

- **Severity:** High 7.6 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Feb 2026
- **Updated:** 28 Feb 2026
- **Also known as:** GHSA-mg9m-c3pr-5p64

## What is CVE-2026-2460?

CVE-2026-2460 is a high-severity missing authorization vulnerability in Hitachi Energy Relion REB500, published on 24 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability exists in REB500 for an authenticated user with low-level privileges to access and alter the content of directories by using the DAC protocol that the user is not authorized to do so.

Weakness: CWE-267 (Privilege Defined With Unsafe Actions)

## Which versions are affected by CVE-2026-2460?

It affects 1 product.


Products: Hitachienergy Reb500 Firmware.

## How do I fix CVE-2026-2460?

No fix has been published for CVE-2026-2460 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2460 being exploited?

There is no known exploitation of CVE-2026-2460 in the wild and no public exploit code.

## Other vulnerabilities in Hitachi Energy Relion REB500

- [CVE-2026-2459](https://insights.sbomify.com/CVE-2026-2459/): Missing authorization in Relion REB500 (high 7.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2460 and fix it if it is affected.

What it is: CVE-2026-2460 is a high-severity missing authorization vulnerability in Hitachi Energy Relion REB500, published on 24 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-2460 in the wild and no public exploit code.

Affected product: Hitachi Energy Relion REB500. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-2460/ (Markdown: https://insights.sbomify.com/CVE-2026-2460/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2460
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2460
- OSV: https://osv.dev/vulnerability/CVE-2026-2460

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2460/
Summaries are generated and may contain mistakes; the official description above is the record.