CVE-2018-0537: Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or

Routine

MEDIUM 6.1DOWNGRADE

CVE-2018-0537 is a medium-severity flaw (CVSS 6.1) affecting qqq systems. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or HTML via quiz_op.cgi.

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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-03-22
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: qqq systems project

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

Am I affected?

Timeline

2018-03-22 13:29 UTCPublished CVE record published
2026-06-17 01:31 UTCUpdated Record last modified

qqq systems project qqq systems DOWNGRADE

Affected: 2.24

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.24

1. Check installed version

apt-cache policy qqq-systems || rpm -q qqq-systems || qqq-systems --version

2. No fixed release: DOWNGRADE to a release before 2.24 (Debian / Ubuntu)

apt-cache madison qqq-systems sudo apt install qqq-systems=<VERSION_BEFORE_2.24> sudo apt-mark hold qqq-systems

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

dnf --showduplicates list qqq-systems sudo dnf downgrade qqq-systems-<VERSION_BEFORE_2.24> sudo dnf versionlock add qqq-systems

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-2018-0537?

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

Is CVE-2018-0537 being exploited?

CVE-2018-0537 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-2018-0537 affect?

CVE-2018-0537 affects qqq systems. Severity is medium (CVSS 6.1). Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or HTML via quiz_op.cgi.

How urgent is CVE-2018-0537?

Priority 35/100. No elevated risk signals yet.

Related CVEs

CVE-2018-0539 CRITICAL 9.8 DOWNGRADE QQQ SYSTEMS version 2.24 allows an attacker to execute arbitrary commands via unspecified vectors.
CVE-2018-0538 MEDIUM 6.1 DOWNGRADE Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or
CVE-2018-0536 MEDIUM 6.1 DOWNGRADE Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or

References

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