CVE-2026-6721 Multiple Vulnerabilities in IBM Concert Software

Critical 9.8 Published 23 Sep 2026 Updated 25 Sep 2026

Unauthenticated remote attackers can execute arbitrary OS commands via crafted input in IBM Concert, leading to remote code execution.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-6721?

CVE-2026-6721 is a critical command injection vulnerability in Ibm Concert, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-78

Which versions are affected by CVE-2026-6721?

It affects 1 product.

Products include Ibm Concert.

How do I fix CVE-2026-6721?

No fix has been published for CVE-2026-6721 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-6721 being exploited?

There is no known exploitation of CVE-2026-6721 in the wild and no public exploit code.

All Ibm Concert vulnerabilities

Sources

Also known as GHSA-v72j-hv4w-mxvh.