# CVE-2026-1772: Information disclosure in RTU500 series CMU firmware

> An unprivileged user can access sensitive user management information in Hitachi Energy RTU500 devices using browser development tools.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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-pwpc-5pp8-7qw9

## What is CVE-2026-1772?

CVE-2026-1772 is a medium-severity vulnerability in Hitachi Energy RTU500 series CMU firmware, published on 24 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

RTU500 web interface: An unprivileged user can read user management information. The information cannot be accessed via the RTU500 web user interface but requires further tools like browser development utilities to access them without required privileges.

Weakness: CWE-280 (Improper Handling of Insufficient Permissions or Privileges)

## Which versions are affected by CVE-2026-1772?

It affects 4 products.


Products: Hitachienergy Rtu520 Firmware, Hitachienergy Rtu530 Firmware, Hitachienergy Rtu540 Firmware, Hitachienergy Rtu560 Firmware.

## How do I fix CVE-2026-1772?

No fix has been published for CVE-2026-1772 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1772 being exploited?

There is no known exploitation of CVE-2026-1772 in the wild and no public exploit code.

## Other vulnerabilities in Hitachi Energy RTU500 series CMU firmware

- [CVE-2026-1773](https://insights.sbomify.com/CVE-2026-1773/): Denial of service in RTU500 series CMU firmware (high 8.7)
- [CVE-2022-2081](https://insights.sbomify.com/CVE-2022-2081/): Denial of service in RTU500 series CMU firmware (high 7.5)
- [CVE-2023-5767](https://insights.sbomify.com/CVE-2023-5767/): Cross-site scripting in RTU500 (medium 6.0)
- [CVE-2023-5768](https://insights.sbomify.com/CVE-2023-5768/): Denial of service in RTU500 series (medium 5.9)
- [CVE-2023-5769](https://insights.sbomify.com/CVE-2023-5769/): Cross-site scripting in RTU500 (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1772 and fix it if it is affected.

What it is: CVE-2026-1772 is a medium-severity vulnerability in Hitachi Energy RTU500 series CMU firmware, 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-2026-1772 in the wild and no public exploit code.

Affected product: Hitachi Energy RTU500 series CMU firmware. 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-2026-1772/ (Markdown: https://insights.sbomify.com/CVE-2026-1772/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1772
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1772
- OSV: https://osv.dev/vulnerability/CVE-2026-1772

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1772/
Summaries are generated and may contain mistakes; the official description above is the record.