CVE-2026-19657: ScadaLTS 2.7.8.1 reflects user-supplied input into an HTML response without sanitization

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-19657 is a medium-severity flaw (CVSS 6.1) affecting scada-lts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ScadaLTS 2.7.8.1 reflects user-supplied input into an HTML response without sanitization. An unauthenticated attacker who lures a victim into visiting a crafted URL can execute arbitrary JavaScript in the context of the victim's browser session.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-08-12
Last modified	2026-10-23

Publisher (CNA): Tenable Network Security, Inc. · Vendor: scada-lts

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-12 20:17 UTCPublished CVE record published
2026-10-23 19:10 UTCUpdated Record last modified

scada-lts scada-lts DOWNGRADE

Affected: 2.7.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.8.1

1. Check installed version

apt-cache policy scada-lts || rpm -q scada-lts || scada-lts --version

2. No fixed release: DOWNGRADE to a release before 2.7.8.1 (Debian / Ubuntu)

apt-cache madison scada-lts sudo apt install scada-lts=<VERSION_BEFORE_2.7.8.1> sudo apt-mark hold scada-lts

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

dnf --showduplicates list scada-lts sudo dnf downgrade scada-lts-<VERSION_BEFORE_2.7.8.1> sudo dnf versionlock add scada-lts

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-2026-19657?

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

Is CVE-2026-19657 being exploited?

CVE-2026-19657 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-2026-19657 affect?

CVE-2026-19657 affects scada-lts. Severity is medium (CVSS 6.1). ScadaLTS 2.7.8.1 reflects user-supplied input into an HTML response without sanitization. An unauthenticated attacker who lures a victim into visiting a crafted URL can execute arbitrary JavaScript in the context of the victim's browser ses

How urgent is CVE-2026-19657?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2026-19656 CRITICAL 9.9 DOWNGRADE ScadaLTS 2.7.8.1 exposes a server-side method that lacks authorization checks, allowing any authenticated user

References

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