CVE-2020-23977: KandNconcepts Club CMS 1.1 and 1.2 has cross site scripting via the 'team.php,player.php,club.php' id paramete

This month

MEDIUM 6.1DOWNGRADE

CVE-2020-23977 is a medium-severity flaw (CVSS 6.1) affecting kandnconcepts club cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KandNconcepts Club CMS 1.1 and 1.2 has cross site scripting via the 'team.php,player.php,club.php' id parameter.

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	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-08-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kandnconcepts club cms project

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

Am I affected?

Timeline

2020-08-27 14:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

kandnconcepts club cms project kandnconcepts club cms DOWNGRADE

Affected: 1.1 · 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy kandnconcepts-club-cms || rpm -q kandnconcepts-club-cms || kandnconcepts-club-cms --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison kandnconcepts-club-cms sudo apt install kandnconcepts-club-cms=<VERSION_BEFORE_1.1> sudo apt-mark hold kandnconcepts-club-cms

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

dnf --showduplicates list kandnconcepts-club-cms sudo dnf downgrade kandnconcepts-club-cms-<VERSION_BEFORE_1.1> sudo dnf versionlock add kandnconcepts-club-cms

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-2020-23977?

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

Is CVE-2020-23977 being exploited?

CVE-2020-23977 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-2020-23977 affect?

CVE-2020-23977 affects kandnconcepts club cms. Severity is medium (CVSS 6.1). KandNconcepts Club CMS 1.1 and 1.2 has cross site scripting via the 'team.php,player.php,club.php' id parameter.

How urgent is CVE-2020-23977?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-23973 CRITICAL 9.8 DOWNGRADE KandNconcepts Club CMS 1.1 and 1.2 has SQL Injection via the 'team.php,player.php,club.php' id parameter.

References

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