---
id: "CVE-2024-55956"
kind: "vulnerability"
aliases: ["CVE-2024-55956"]
title: "In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Cleo Multiple Products", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "cleo harmony", "fixed": ["5.8.0.24"], "affected": "< 5.8.0.24", "ecosystem": "vendor"}, {"name": "cleo lexicom", "fixed": ["5.8.0.24"], "affected": "< 5.8.0.24", "ecosystem": "vendor"}, {"name": "cleo vltrader", "fixed": ["5.8.0.24"], "affected": "< 5.8.0.24", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["cleo", "exploited", "harmony", "lexicom", "managed-file-transfer", "ransomware", "self-hosted", "vendor", "vltrader"]
not_affected_if: ["product-not-installed"]
published_at: "2024-12-13T21:15:13+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-55956", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-55956", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can…

Cleo Harmony, VLTrader and LexiCom, managed file transfer products, accept file uploads without authentication. An attacker can drop a file into the Autorun directory and have it executed as bash or PowerShell commands on the host.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Cleo Multiple Products affected ? fixed ?
- vendor:cleo harmony affected < 5.8.0.24 fixed 5.8.0.24
- vendor:cleo lexicom affected < 5.8.0.24 fixed 5.8.0.24
- vendor:cleo vltrader affected < 5.8.0.24 fixed 5.8.0.24

## How to check

Check whether Cleo Harmony, VLTrader or LexiCom is installed and whether the Autorun directory is exposed to network uploads; the sources do not give a specific command or file path.

## Fix

Apply the vendor mitigations per Cleo's advisory, or discontinue use of the product if mitigations are unavailable (CISA required action).

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-55956
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2024-55956

## From the sources

Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability that could allow an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_