How severe is CVE-2023-53891?

CVE-2023-53891 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-2023-53891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-53891?

CVE-2023-53891 affects Blackcat-cms Blackcat Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-53891?

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

Does CVE-2023-53891 have an EU (EUVD) identifier?

Yes. CVE-2023-53891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203419.

When was CVE-2023-53891 published?

CVE-2023-53891 was published on 2025-12-15 and last updated on 2026-06-17.

CVE-2023-53891

CVE-2023-53891 is a medium-severity vulnerability in Blackcat-cms Blackcat Cms 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 v4: 5.1
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203419
Weakness: CWE-79
Affected product: Blackcat-cms Blackcat Cms
Published: 2025-12-15
Last modified: 2026-06-17

Description

Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page.

Frequently asked questions

What is CVE-2023-53891?: Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page.
How severe is CVE-2023-53891?: CVE-2023-53891 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-2023-53891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-53891?: CVE-2023-53891 affects Blackcat-cms Blackcat Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-53891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-53891 have an EU (EUVD) identifier?: Yes. CVE-2023-53891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203419.
When was CVE-2023-53891 published?: CVE-2023-53891 was published on 2025-12-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:blackcat-cms:blackcat_cms:1.4:*:*:*:*:*:*:*

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