CVE-2025-56704: LeptonCMS version 7.3.0 contains an arbitrary file upload vulnerability, which is caused by the lack of proper

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HIGH 8.8DOWNGRADE

CVE-2025-56704 is a high-severity flaw (CVSS 8.8) affecting leptoncms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-12-09
Last modified	2026-10-14

Publisher (CNA): MITRE · Vendor: lepton-cms

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-09 17:15 UTCPublished CVE record published
2026-10-14 21:10 UTCUpdated Record last modified

lepton-cms leptoncms DOWNGRADE

Affected: 7.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.3.0

1. Check installed version

apt-cache policy leptoncms || rpm -q leptoncms || leptoncms --version

2. No fixed release: DOWNGRADE to a release before 7.3.0 (Debian / Ubuntu)

apt-cache madison leptoncms sudo apt install leptoncms=<VERSION_BEFORE_7.3.0> sudo apt-mark hold leptoncms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list leptoncms sudo dnf downgrade leptoncms-<VERSION_BEFORE_7.3.0> sudo dnf versionlock add leptoncms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-56704?

leptoncms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-56704 being exploited?

CVE-2025-56704 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-56704 affect?

CVE-2025-56704 affects leptoncms. Severity is high (CVSS 8.8). 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

How urgent is CVE-2025-56704?

Priority 50/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2024-24520 HIGH 7.8 DOWNGRADE An issue in Lepton CMS v.7.0.0 allows a local attacker to execute arbitrary code via the upgrade.php file in t
CVE-2024-29515 HIGH 8.8 DOWNGRADE File Upload vulnerability in lepton v.7.1.0 allows a remote authenticated attackers to execute arbitrary code
CVE-2024-29514 HIGH 8.8 DOWNGRADE File Upload vulnerability in lepton v.7.1.0 allows a remote authenticated attackers to execute arbitrary code

References

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