CVE-2026-22553: All versions of InSAT MasterSCADA BUK-TS are susceptible to OS command injection through a field in its MMadmS

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CRITICAL 9.8REMOTEMITIGATE

CVE-2026-22553 is a critical-severity flaw (CVSS 9.8) affecting masterscada. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of InSAT MasterSCADA BUK-TS are susceptible to OS command injection through a field in its MMadmServ web interface. Malicious users that use the vulnerable endpoint are potentially able to cause remote code execution.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-02-24
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: insat

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 21:16 UTCPublished CVE record published
2026-06-17 10:20 UTCUpdated Record last modified

insat masterscada MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy masterscada || rpm -q masterscada || masterscada --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · intel-ipsec-mb · FIXED · 3.0.1-1.eln159 · FEDORA-2026-ca01077210 · source

sudo dnf upgrade --advisory=FEDORA-2026-ca01077210

Fedora 46 · complytime-providers · FIXED · 0.3.0-2.fc46 · FEDORA-2026-7c372be466 · source

sudo dnf upgrade --advisory=FEDORA-2026-7c372be466

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: mbanyamer/CVE-2026-22553-InSAT-MasterSCADA-BUK-TS-MMadmServ (0 stars)

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-2026-22553?

masterscada: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-22553 being exploited?

CVE-2026-22553 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-2026-22553 affect?

CVE-2026-22553 affects masterscada. Severity is critical (CVSS 9.8). All versions of InSAT MasterSCADA BUK-TS are susceptible to OS command injection through a field in its MMadmServ web interface. Malicious users that use the vulnerable endpoint are potentially able to cause remote code execution.

How urgent is CVE-2026-22553?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-21410 CRITICAL 9.8 MITIGATE InSAT MasterSCADA BUK-TS is susceptible to SQL Injection through its main web interface

References

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