Cleo vulnerabilities and fixes

CVEs that mention Cleo, ranked by priority. 2 tracked.

Cleo has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 0. Most recent: 2026-09-01. Highest priority: CVE-2026-84115 (score 44/100).

• CVE-2026-84115 HIGH 8.3 A vulnerability was found in Cleo Harmony up to 5.8.1.10
• CVE-2026-84114 MEDIUM 6.3 A vulnerability has been found in Cleo Harmony up to 5.8.1.10

FAQ

How do I fix Cleo vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is Cleo being exploited right now?

None of the tracked Cleo CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which Cleo CVE should I patch first?

CVE-2026-84115 currently ranks highest (44/100): A vulnerability was found in Cleo Harmony up to 5.8.1.10.

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