Quick answers
- Is CVE-2026-6730 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-6730 being exploited in the wild.
- How severe is CVE-2026-6730?
- 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-2026-6730?
- 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-2026-6730 attacked?
- It is attacked with local access, in a hosted service.
- Am I affected by CVE-2026-6730?
- 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 buffer overflow exists in IBM Concert caused by improper bounds checking. The vulnerability is exploitable by a local user to execute arbitrary code on the affected system. The attack requires local access and no authentication bypass is mentioned, indicating the attacker must already have user-level access to the system.
Affected products
- IBM Concert 1.0.0 through 3.0.0
Timeline
- 2026-09-23: disclosed