How severe is CVE-2023-53921?

CVE-2023-53921 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-53921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-53921?

CVE-2023-53921 affects Sitemagic Sitemagic Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-53921?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2023-53921 have an EU (EUVD) identifier?

Yes. CVE-2023-53921 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-60210.

When was CVE-2023-53921 published?

CVE-2023-53921 was published on 2025-12-17 and last updated on 2026-06-17.

CVE-2023-53921

CVE-2023-53921 is a critical-severity vulnerability in Sitemagic Sitemagic Cms with a CVSS 3.x base score of 9.8. 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-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.7
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-60210
Weakness: CWE-434
Affected product: Sitemagic Sitemagic Cms
Published: 2025-12-17
Last modified: 2026-06-17

Description

SitemagicCMS 4.4.3 contains a remote code execution vulnerability that allows attackers to upload malicious PHP files to the files/images directory. Attackers can upload a .phar file with system command execution payload to compromise the web application and execute arbitrary system commands.

Frequently asked questions

What is CVE-2023-53921?: SitemagicCMS 4.4.3 contains a remote code execution vulnerability that allows attackers to upload malicious PHP files to the files/images directory. Attackers can upload a .phar file with system command execution payload to compromise the web application and execute arbitrary system commands.
How severe is CVE-2023-53921?: CVE-2023-53921 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-53921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-53921?: CVE-2023-53921 affects Sitemagic Sitemagic Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-53921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2023-53921 have an EU (EUVD) identifier?: Yes. CVE-2023-53921 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-60210.
When was CVE-2023-53921 published?: CVE-2023-53921 was published on 2025-12-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sitemagic:sitemagic_cms:4.4.3:*:*:*:*:*:*:*

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