CVE-2018-18991: Reflected cross-site scripting (non-persistent) in SCADA WebServer (Versions prior to 2.03.0001) could allow a

Q: How do I fix CVE-2018-18991?

scada webserver: upgrade to 2.03.0001. Exact commands for each OS are on this page.

Q: Is CVE-2018-18991 being exploited?

CVE-2018-18991 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-2018-18991 affect?

CVE-2018-18991 affects scada webserver. Severity is medium (CVSS 6.1). Reflected cross-site scripting (non-persistent) in SCADA WebServer (Versions prior to 2.03.0001) could allow an attacker to send a crafted URL that contains JavaScript, which can be reflected off the web application to the victim's browser.

Q: How urgent is CVE-2018-18991?

Priority 36/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2018-18991 is a medium-severity flaw (CVSS 6.1) affecting scada webserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Reflected cross-site scripting (non-persistent) in SCADA WebServer (Versions prior to 2.03.0001) could allow an attacker to send a crafted URL that contains JavaScript, which can be reflected off the web application to the victim's browser.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-12-04
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2018-12-04 21:29 UTCPublished CVE record published
2026-06-17 01:48 UTCUpdated Record last modified

spidercontrol scada webserver UPGRADE

Affected: < 2.03.0001

Fixed in: 2.03.0001

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.03.0001 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade scada-webserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade scada-webserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2018-18991?

scada webserver: upgrade to 2.03.0001. Exact commands for each OS are on this page.

Is CVE-2018-18991 being exploited?

CVE-2018-18991 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-2018-18991 affect?

CVE-2018-18991 affects scada webserver. Severity is medium (CVSS 6.1). Reflected cross-site scripting (non-persistent) in SCADA WebServer (Versions prior to 2.03.0001) could allow an attacker to send a crafted URL that contains JavaScript, which can be reflected off the web application to the victim's browser.

How urgent is CVE-2018-18991?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2017-12728 HIGH 7.8 UPGRADE An Improper Privilege Management issue was discovered in SpiderControl SCADA Web Server Version 2.02.0007 and

References

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