CVE-2018-18692: A reflected Cross-Site scripting (XSS) vulnerability in SEMCO Semcosoft 5.3 allows remote attackers to inject

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MEDIUM 6.1DOWNGRADE

CVE-2018-18692 is a medium-severity flaw (CVSS 6.1) affecting semcosoft. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected Cross-Site scripting (XSS) vulnerability in SEMCO Semcosoft 5.3 allows remote attackers to inject arbitrary web scripts or HTML via the username parameter to the Login Form.

Why this priority

Public exploit reference

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	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-02-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: semcosoft

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

Am I affected?

Timeline

2019-02-23 11:29 UTCPublished CVE record published
2026-06-17 01:47 UTCUpdated Record last modified

semcosoft semcosoft DOWNGRADE

Affected: 5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.3 (Debian / Ubuntu)

apt-cache madison semcosoft sudo apt install semcosoft=<VERSION_BEFORE_5.3> sudo apt-mark hold semcosoft

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

dnf --showduplicates list semcosoft sudo dnf downgrade semcosoft-<VERSION_BEFORE_5.3> sudo dnf versionlock add semcosoft

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-2018-18692?

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

Is CVE-2018-18692 being exploited?

CVE-2018-18692 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-2018-18692 affect?

CVE-2018-18692 affects semcosoft. Severity is medium (CVSS 6.1). A reflected Cross-Site scripting (XSS) vulnerability in SEMCO Semcosoft 5.3 allows remote attackers to inject arbitrary web scripts or HTML via the username parameter to the Login Form.

How urgent is CVE-2018-18692?

Priority 42/100. Public exploit reference

References

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