CVE-2026-8603: In ScadaBR version 1.2.0, an OS Command Injection vulnerability could allow an attacker to execute commands as

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-8603 is a critical-severity flaw (CVSS 9.8) affecting scadabr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In ScadaBR version 1.2.0, an OS Command Injection vulnerability could allow an attacker to execute commands as root on the SCADA system.

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	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-05-19
Last modified	2026-07-23

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

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 18:16 UTCPublished CVE record published
2026-07-23 20:10 UTCUpdated Record last modified

scadabr scadabr DOWNGRADE

Affected: 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison scadabr sudo apt install scadabr=<VERSION_BEFORE_1.2> sudo apt-mark hold scadabr

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list scadabr sudo dnf downgrade scadabr-<VERSION_BEFORE_1.2> sudo dnf versionlock add scadabr

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · proftpd · FIXED · 1.3.9e-1.fc46 · FEDORA-2026-fc0d87d66e · source

sudo dnf upgrade --advisory=FEDORA-2026-fc0d87d66e

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-2026-8603?

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

Is CVE-2026-8603 being exploited?

CVE-2026-8603 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-2026-8603 affect?

CVE-2026-8603 affects scadabr. Severity is critical (CVSS 9.8). In ScadaBR version 1.2.0, an OS Command Injection vulnerability could allow an attacker to execute commands as root on the SCADA system.

How urgent is CVE-2026-8603?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

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References

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