How severe is CVE-2021-43742?

CVE-2021-43742 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-43742 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43742?

CVE-2021-43742 affects Cmsimple. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43742?

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

When was CVE-2021-43742 published?

CVE-2021-43742 was published on 2022-04-13 and last updated on 2026-06-17.

CVE-2021-43742

CVE-2021-43742 is a medium-severity vulnerability in Cmsimple with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Cmsimple
Published: 2022-04-13
Last modified: 2026-06-17

Description

CMSimple 5.4 is vulnerable to Cross Site Scripting (XSS) via the file upload feature.

Frequently asked questions

What is CVE-2021-43742?: CMSimple 5.4 is vulnerable to Cross Site Scripting (XSS) via the file upload feature.
How severe is CVE-2021-43742?: CVE-2021-43742 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-43742 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43742?: CVE-2021-43742 affects Cmsimple. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43742?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43742 published?: CVE-2021-43742 was published on 2022-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cmsimple:cmsimple:5.4:*:*:*:*:*:*:*

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