CVE-2026-9645: Exposed methods allow authenticated users to create and execute arbitrary JavaScript code on the server

This month

CRITICAL 9.9DOWNGRADE

CVE-2026-9645 is a critical-severity flaw (CVSS 9.9) affecting scadabr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Exposed methods allow authenticated users to create and execute arbitrary JavaScript code on the server. The scripts execute with full access, enabling complete system compromise as commands are executed as root.

Why this priority

Critical severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-05-28
Last modified	2026-08-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: scadabr

Last updated 2026-08-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-28 21:16 UTCPublished CVE record published
2026-08-17 15:35 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.

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-2026-9645?

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

Is CVE-2026-9645 being exploited?

CVE-2026-9645 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-2026-9645 affect?

CVE-2026-9645 affects scadabr. Severity is critical (CVSS 9.9). Exposed methods allow authenticated users to create and execute arbitrary JavaScript code on the server. The scripts execute with full access, enabling complete system compromise as commands are executed as root.

How urgent is CVE-2026-9645?

Priority 43/100. Critical severity

Related CVEs

CVE-2026-9646 MEDIUM 6.1 DOWNGRADE A reflected cross-site scripting issue exists in URL handling.
CVE-2026-8603 CRITICAL 9.8 DOWNGRADE In ScadaBR version 1.2.0, an OS Command Injection vulnerability could allow an attacker to execute commands as
CVE-2026-8602 CRITICAL 9.1 DOWNGRADE In ScadaBR version 1.2.0, a Missing Authentication for Critical Function vulnerability could allow an unauthen
CVE-2026-8605 CRITICAL 9.8 DOWNGRADE In ScadaBR version 1.2.0, a Use of Hard-Coded Credentials vulnerability could allow an attacker to access the
CVE-2026-8604 HIGH 8.8 DOWNGRADE In ScadaBR version 1.2.0, a CSRF vulnerability could allow an attacker to trigger any authenticated action thr

References

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