Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-15266 Overview
IBM Concert 1.0 through 3.0.1.1 contains components that allow potentially unsafe command execution, which could be exploited to run arbitrary system commands on the host.
Critical Impact
Affected Products
- IBM Concert: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-08: CVE-2026-15266 published to the National Vulnerability Database by psirt@us.ibm.com
- 2026-11-08: last updated in the NVD database
Technical Details for CVE-2026-15266
Vulnerability Analysis
CVE-2026-15266 is a OS Command Injection weakness (CWE-78: OS Command Injection) in IBM Concert. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Untrusted input is passed to the operating system shell, letting an attacker run commands.
With a CVSS base score of 9.8, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-78: OS Command Injection. Untrusted input is passed to the operating system shell, letting an attacker run commands.
Attack Vector
Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is low complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Detection Methods for CVE-2026-15266
Detection Strategies
- Inventory every instance of IBM Concert and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward IBM Concert application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-15266
Immediate Actions Required
- Apply the fixed version of IBM Concert named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for IBM Concert.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-78: OS Command Injection More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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