Quick answers
- Is CVE-2026-6721 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-6721 being exploited in the wild.
- How severe is CVE-2026-6721?
- Critical severity, with a CVSS score of 9.8, published 23 September 2026.
- Which products and versions are affected?
- IBM Concert 1.0.0 through 3.0.0.
- Is there a fix for CVE-2026-6721?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-6721 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-6721?
- Check whether you run IBM Concert at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A classic OS command injection vulnerability in IBM Concert versions 1.0.0 through 3.0.0 allows unauthenticated remote attackers to supply specially crafted input that is incorporated into OS commands without proper sanitization. Successful exploitation results in arbitrary command execution on the underlying system with the privileges of the affected application. No authentication is required; the attack is network-accessible.
Affected products
- IBM Concert 1.0.0 through 3.0.0
Timeline
- 2026-09-23: disclosed