Vendor History

IT management, remote access and backup

Cleo (file transfer) security incident history

Updated . Data gathered daily from official public sources.

As of Oct 26, 2026, Vendor History found 2 actively exploited security flaws for Cleo (file transfer), dated Dec 13, 2024 to Dec 17, 2024. Sources checked: the California and Washington Attorney General breach lists and CISA's Known Exploited Vulnerabilities catalog.

Breach notices and SEC cyber filings

None found in the sources we check.

Got a breach letter from Cleo (file transfer)? What to do when a vendor has a data breach.

Actively exploited security flaws

Flaws in Cleo (file transfer) products that CISA lists as exploited by attackers. If you use an affected product, check that it's updated. What a listing means.

  1. Exploited flaw

    Cleo Multiple Products Unauthenticated File Upload Vulnerability (CVE-2024-55956). Added to CISA's list of security flaws known to be exploited by attackers. CISA lists it as used in ransomware campaigns.

    Source: CISA Known Exploited Vulnerabilities catalog

  2. Exploited flaw

    Cleo Multiple Products Unrestricted File Upload Vulnerability (CVE-2024-50623). Added to CISA's list of security flaws known to be exploited by attackers. CISA lists it as used in ransomware campaigns.

    Source: CISA Known Exploited Vulnerabilities catalog

We check: California and Washington Attorney General breach notices, SEC cyber incident filings (Form 8-K, Item 1.05) and CISA's catalog of actively exploited security flaws. An empty section means we found nothing in those sources. It does not mean nothing happened. How it works

To cite: Vendor History, "Cleo (file transfer) security incident history," vendorhistory.com/vendor/cleo, data checked Oct 26, 2026. Free to reuse under CC BY 4.0 with credit to Vendor History.