How severe is CVE-2025-56704?

CVE-2025-56704 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-56704 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-56704?

CVE-2025-56704 affects Lepton-cms Leptoncms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-56704?

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

Does CVE-2025-56704 have an EU (EUVD) identifier?

Yes. CVE-2025-56704 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202289.

When was CVE-2025-56704 published?

CVE-2025-56704 was published on 2025-12-09 and last updated on 2026-07-05.

CVE-2025-56704

CVE-2025-56704 is a high-severity vulnerability in Lepton-cms Leptoncms with a CVSS 3.x base score of 8.8. 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: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202289
Weakness: CWE-434
Affected product: Lepton-cms Leptoncms
Published: 2025-12-09
Last modified: 2026-07-05

Description

LeptonCMS version 7.3.0 contains an arbitrary file upload vulnerability, which is caused by the lack of proper validation for uploaded files. An authenticated attacker can exploit this vulnerability by uploading a specially crafted ZIP/PHP file to execute arbitrary code.

Frequently asked questions

What is CVE-2025-56704?: LeptonCMS version 7.3.0 contains an arbitrary file upload vulnerability, which is caused by the lack of proper validation for uploaded files. An authenticated attacker can exploit this vulnerability by uploading a specially crafted ZIP/PHP file to execute arbitrary code.
How severe is CVE-2025-56704?: CVE-2025-56704 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-56704 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-56704?: CVE-2025-56704 affects Lepton-cms Leptoncms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-56704?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-56704 have an EU (EUVD) identifier?: Yes. CVE-2025-56704 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202289.
When was CVE-2025-56704 published?: CVE-2025-56704 was published on 2025-12-09 and last updated on 2026-07-05.

References

EU advisories (EUVD)

http://lepton.com

Affected products (1)

cpe:2.3:a:lepton-cms:leptoncms:7.3.0:*:*:*:*:*:*:*

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