CVE-2026-1772: RTU500 web interface: An unprivileged user can read user management information

Q: How do I fix CVE-2026-1772?

rtu520 firmware: upgrade to 13.7.8; rtu530 firmware: upgrade to 13.7.8; rtu540 firmware: upgrade to 13.7.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-1772 being exploited?

CVE-2026-1772 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-1772 affect?

CVE-2026-1772 affects rtu520 firmware, rtu530 firmware, rtu540 firmware. Severity is medium (CVSS 5.3). 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 requi

Q: How urgent is CVE-2026-1772?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-1772 is a medium-severity flaw (CVSS 5.3) affecting rtu520 firmware, rtu530 firmware, rtu540 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-280
Published	2026-02-24
Last modified	2026-06-17

Publisher (CNA): Hitachi Energy · Vendor: hitachienergy

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-24 14:16 UTCPublished CVE record published
2026-06-17 10:16 UTCUpdated Record last modified

hitachienergy rtu520 firmware UPGRADE

Affected: >= 12.7.1 and <= 12.7.7 · >= 13.5.1 and <= 13.5.4 · >= 13.6.1 and <= 13.6.2 · >= 13.7.1 and < 13.7.8 · 13.8.1

Fixed in: 13.7.8

Safe to downgrade to: a release before 12.7.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

hitachienergy rtu530 firmware UPGRADE

Affected: >= 12.7.1 and <= 12.7.7 · >= 13.5.1 and <= 13.5.4 · >= 13.6.1 and <= 13.6.2 · >= 13.7.1 and < 13.7.8 · 13.8.1

Fixed in: 13.7.8

Safe to downgrade to: a release before 12.7.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

hitachienergy rtu540 firmware UPGRADE

Affected: >= 12.7.1 and <= 12.7.7 · >= 13.5.1 and <= 13.5.4 · >= 13.6.1 and <= 13.6.2 · >= 13.7.1 and < 13.7.8 · 13.8.1

Fixed in: 13.7.8

Safe to downgrade to: a release before 12.7.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

hitachienergy rtu560 firmware UPGRADE

Affected: >= 12.7.1 and <= 12.7.7 · >= 13.5.1 and <= 13.5.4 · >= 13.6.1 and <= 13.6.2 · >= 13.7.1 and < 13.7.8 · 13.8.1

Fixed in: 13.7.8

Safe to downgrade to: a release before 12.7.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1772?

rtu520 firmware: upgrade to 13.7.8; rtu530 firmware: upgrade to 13.7.8; rtu540 firmware: upgrade to 13.7.8. Exact commands for each OS are on this page.

Is CVE-2026-1772 being exploited?

CVE-2026-1772 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1772 affect?

CVE-2026-1772 affects rtu520 firmware, rtu530 firmware, rtu540 firmware. Severity is medium (CVSS 5.3). 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 requi

How urgent is CVE-2026-1772?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-1773 HIGH 7.5 UPGRADE UPGRADE IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame. Pro

References

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