# CVE-2026-15266: IBM Concert arbitrary command execution in dependencies

Source: https://junglewise.ai/threats/cve-2026-15266-ibm-concert-1-0-through-3-0-1-1-contains-components-that-allow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-08. Updated: 2026-11-08  
License: CC BY 4.0 with a link back

CVE-2026-15266 · Severity: critical · CVSS 9.8 · Published 2026-11-08

IBM Concert is enterprise software for data protection and platform management. A critical vulnerability allows attackers to execute arbitrary system commands on hosts running Concert, potentially enabling complete system compromise and unauthorized access to protected data.

Technologies: [IBM Concert](https://junglewise.ai/threats/technologies/concert). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-15266 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15266 being exploited in the wild.

**How severe is CVE-2026-15266?** Critical severity, with a CVSS score of 9.8, published 8 November 2026.

**Which products and versions are affected?** IBM Concert 1.0 through 3.0.1.1; IBM Concert Platform prior to 3.0.3; IBM Concert Protect prior to 3.1.0.

**Is there a fix for CVE-2026-15266?** 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-2026-15266 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-15266?** Check whether you run IBM Concert, IBM Concert Platform or IBM Concert Protect 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

The vulnerability stems from unsafe command execution in third-party components bundled with IBM Concert 1.0–3.0.1.1. Multiple high-severity CVEs are present, including command injection flaws (CVE-2026-9277 in shell-quote), memory-safety issues (CVE-2026-33815 in pgx), and resource exhaustion bugs. An unauthenticated network attacker can exploit these to achieve remote code execution and denial of service.

## Affected products

- IBM Concert 1.0 through 3.0.1.1
- IBM Concert Protect prior to 3.1.0
- IBM Concert Platform prior to 3.0.3

## Timeline

- 2026-11-08: disclosed

## References

- [https://www.ibm.com/support/pages/node/7294607](https://www.ibm.com/support/pages/node/7294607)

## Related threats

- [IBM Concert command injection vulnerability](https://junglewise.ai/threats/cve-2026-6715-ibm-concert-1-0-through-3-0-1-1-allows-an-attacker-can-supply)
- [IBM Concert weak cryptographic algorithms allow decryption](https://junglewise.ai/threats/cve-2026-6719-ibm-concert-1-0-through-3-0-0-uses-weaker-than-expected)
- [IBM Concert cross-site scripting in Web UI](https://junglewise.ai/threats/cve-2026-4413-ibm-concert-1-0-through-3-0-0-is-vulnerable-to-cross-site)
- [IBM Concert local web cache accessible to other users](https://junglewise.ai/threats/cve-2026-4405-ibm-concert-1-0-through-3-0-0-allows-web-page-cache-to-be-stored)
- [IBM Concert information disclosure through schema suggestions](https://junglewise.ai/threats/cve-2026-3628-ibm-concert-1-0-through-3-0-0-allows-information-disclosure)