CVE-2021-45018: Cross Site Scripting (XSS) vulnerability exists in Catfish <=6.3.0 via a Google search in url:/catfishcms/inde

Q: How do I fix CVE-2021-45018?

catfish cms: upgrade to newer than 6.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-45018 being exploited?

CVE-2021-45018 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-2021-45018 affect?

CVE-2021-45018 affects catfish cms. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability exists in Catfish <=6.3.0 via a Google search in url:/catfishcms/index.php/admin/Index/addmenu.htmland then the .html file on the website that uses this editor (the file suffix is allowed).

Q: How urgent is CVE-2021-45018?

Priority 38/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2021-45018 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.

Cross Site Scripting (XSS) vulnerability exists in Catfish <=6.3.0 via a Google search in url:/catfishcms/index.php/admin/Index/addmenu.htmland then the .html file on the website that uses this editor (the file suffix is allowed).

Why this priority

Public exploit reference

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	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-15
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

2021-12-15 23:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

catfish-cms catfish cms UPGRADE

Affected: <= 6.3.0

Fixed in: newer than 6.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 6.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade catfish-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade catfish-cms

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-2021-45018?

catfish cms: upgrade to newer than 6.3.0. Exact commands for each OS are on this page.

Is CVE-2021-45018 being exploited?

CVE-2021-45018 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-2021-45018 affect?

CVE-2021-45018 affects catfish cms. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability exists in Catfish <=6.3.0 via a Google search in url:/catfishcms/index.php/admin/Index/addmenu.htmland then the .html file on the website that uses this editor (the file suffix is allowed).

How urgent is CVE-2021-45018?

Priority 38/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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
CVE-2020-23962 MEDIUM 6.1 DOWNGRADE A cross site scripting (XSS) vulnerability in Catfish CMS 4.9.90 allows attackers to execute arbitrary web scr

References

← Back to latest CVEs