How severe is CVE-2021-47733?

CVE-2021-47733 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-2021-47733 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-47733?

CVE-2021-47733 affects Cmsimple. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-47733?

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

Does CVE-2021-47733 have an EU (EUVD) identifier?

Yes. CVE-2021-47733 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204822.

When was CVE-2021-47733 published?

CVE-2021-47733 was published on 2025-12-23 and last updated on 2026-06-17.

CVE-2021-47733

CVE-2021-47733 is a medium-severity vulnerability in Cmsimple 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 v4: 5.1
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204822
Weakness: CWE-79
Affected product: Cmsimple
Published: 2025-12-23
Last modified: 2026-06-17

Description

CMSimple 5.4 contains a cross-site scripting vulnerability that allows attackers to bypass input filtering by using HTML to Unicode encoding. Attackers can inject malicious scripts by encoding payloads like ')-alert(1)// and execute arbitrary JavaScript when victims interact with delete buttons.

Frequently asked questions

What is CVE-2021-47733?: CMSimple 5.4 contains a cross-site scripting vulnerability that allows attackers to bypass input filtering by using HTML to Unicode encoding. Attackers can inject malicious scripts by encoding payloads like ')-alert(1)// and execute arbitrary JavaScript when victims interact with delete buttons.
How severe is CVE-2021-47733?: CVE-2021-47733 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-2021-47733 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-47733?: CVE-2021-47733 affects Cmsimple. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-47733?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2021-47733 have an EU (EUVD) identifier?: Yes. CVE-2021-47733 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204822.
When was CVE-2021-47733 published?: CVE-2021-47733 was published on 2025-12-23 and last updated on 2026-06-17.

References

Affected products (1)

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

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