How severe is CVE-2021-45018?

CVE-2021-45018 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-45018 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45018?

CVE-2021-45018 affects Catfish-cms Catfish Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45018?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-45018 published?

CVE-2021-45018 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-45018

CVE-2021-45018 is a medium-severity vulnerability in Catfish-cms Catfish Cms with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Catfish-cms Catfish Cms
Published: 2021-12-15
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is CVE-2021-45018?: 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 severe is CVE-2021-45018?: CVE-2021-45018 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-45018 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45018?: CVE-2021-45018 affects Catfish-cms Catfish Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45018?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-45018 published?: CVE-2021-45018 was published on 2021-12-15 and last updated on 2026-06-17.

References

https://github.com/xwlrbh/Catfish/issues/9

Affected products (1)

cpe:2.3:a:catfish-cms:catfish_cms:*:*:*:*:*:*:*:*

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