CVE-2026-6721: IBM Concert

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

IBM Concert 1.0.0 through 3.0.0 allows an unauthenticated remote attacker can supply specially crafted input that is incorporated into OS commands, resulting in arbitrary command execution on the underlying system. Successful exploitation allows remote code execution with the privileges of the affected application.

Affected products

• IBM Concert: from 1.0.0, up to and including 3.0.0

Published 2026-09-23. Last modified 2026-09-28.