CVE-2020-23962: A cross site scripting (XSS) vulnerability in Catfish CMS 4.9.90 allows attackers to execute arbitrary web scr

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-23962 is a medium-severity flaw (CVSS 6.1) affecting catfish cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross site scripting (XSS) vulnerability in Catfish CMS 4.9.90 allows attackers to execute arbitrary web scripts or HTML via a crafted payload entered into the "announcement_gonggao" 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	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-06-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: catfish-cms

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

Am I affected?

Timeline

2021-06-23 19:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

catfish-cms catfish cms DOWNGRADE

Affected: 4.9.90

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.9.90

1. Check installed version

apt-cache policy catfish-cms || rpm -q catfish-cms || catfish-cms --version

2. No fixed release: DOWNGRADE to a release before 4.9.90 (Debian / Ubuntu)

apt-cache madison catfish-cms sudo apt install catfish-cms=<VERSION_BEFORE_4.9.90> sudo apt-mark hold catfish-cms

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

dnf --showduplicates list catfish-cms sudo dnf downgrade catfish-cms-<VERSION_BEFORE_4.9.90> sudo dnf versionlock add catfish-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-2020-23962?

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

Is CVE-2020-23962 being exploited?

CVE-2020-23962 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-2020-23962 affect?

CVE-2020-23962 affects catfish cms. Severity is medium (CVSS 6.1). A cross site scripting (XSS) vulnerability in Catfish CMS 4.9.90 allows attackers to execute arbitrary web scripts or HTML via a crafted payload entered into the "announcement_gonggao" parameter.

How urgent is CVE-2020-23962?

Priority 39/100. Public exploit reference

Related CVEs

CVE-2021-45018 MEDIUM 6.1 UPGRADE Cross Site Scripting (XSS) vulnerability exists in Catfish <=6.3.0 via a Google search in url:/catfishcms/inde
CVE-2021-45017 HIGH 8.8 UPGRADE Cross Site Request Forgery (CSRF) vulnerability exits in Catfish <=6.1.* when you upload an html file containi

References

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