# CVE-2026-6721

Unauthenticated OS command injection in IBM Concert allows remote code execution.

- Page: https://www.vulneraibility.com/cve/CVE-2026-6721
- CVSS: 9.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 1.19% (percentile 68.2)
- CISA SSVC: exploitation none, automatable yes, technical impact total (assessed 2026-09-24)
- Weakness: CWE-78
- Published: 2026-09-23

## Affected versions

- IBM Concert: affected >= 1.0.0 and <= 3.0.0

A version outside these ranges is not a statement that it is unaffected.

## Impact

Unauthenticated remote command injection (CWE-78) yields remote code execution as the application user, enabling system compromise and lateral movement.

## Action

Immediate action required

## Recommendation

Isolate/segregate Concert, block access, deploy WAF rules, apply vendor patch when released

## References

- [patch] https://www.ibm.com/support/pages/node/7288830

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.