CVE-2024-50623
CRITICALCVE-2024-50623 is a critical-severity (CVSS 9.8) Unrestricted File Upload vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2024-12-13) and has been used in ransomware campaigns — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2024-12-13 — including use in ransomware campaigns. Federal agencies were required to remediate by 2025-01-03.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2024-50623.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2024-50623 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 395,249 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.
Affected Products
harmonycleolexicomcleovltradercleoResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom b…
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom b…
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom b…
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom b…
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2024-50623 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.
How to detect CVE-2024-50623
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2024-50623 -u https://target- Template
- Cleo Harmony < 5.8.0.21 - Arbitary File Read
- Severity
- high
- Impact
- Attackers can exploit vulnerabilities to compromise the system.
- Remediation
- Update to the latest patched version addressing CVE-2024-50623.
Template by ProjectDiscovery nuclei-templates (DhiyaneshDK), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2024-50623 in your dependencies?
Find it across , including transitive dependencies.