# CVE-2026-19646: IBM Common Licensing Agent HTTP Host header redirect

Source: https://junglewise.ai/threats/cve-2026-19646-ibm-common-licensing-agent-http-host-header-redirect  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-19646 · Severity: critical · CVSS 9.1 · Published 2026-09-10

IBM Common Licensing Agent and Administration and Reporting Tool (ART) are used to manage software licenses across enterprise systems. A flaw in these products allows remote attackers to redirect users to arbitrary websites through improper validation of the HTTP Host header, potentially capturing credentials or delivering malware without requiring authentication or user interaction.

Technologies: [IBM Common Licensing Agent](https://junglewise.ai/threats/technologies/common-licensing-agent). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-19646 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19646 being exploited in the wild.

**How severe is CVE-2026-19646?** Critical severity, with a CVSS score of 9.1, published 10 September 2026.

**Which products and versions are affected?** IBM Common Licensing Agent 9.0, 9.0.0.1, 9.0.0.2; IBM License Key Server Administration and Reporting Tool (ART) 9.0, 9.0.0.1, 9.0.0.2.

**Is there a fix for CVE-2026-19646?** 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-2026-19646 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-19646?** Check whether you run IBM Common Licensing Agent or IBM License Key Server Administration and Reporting Tool (ART) 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

IBM Common Licensing Agent suffers from improper validation of the HTTP Host header, enabling an open redirect vulnerability. The vulnerable component fails to validate or sanitize the Host header before using it in redirect responses or generating URLs. An unauthenticated remote attacker can exploit this over the network by crafting a malicious request with a Host header pointing to an attacker-controlled domain, causing the application to redirect victims to arbitrary external sites. This can be leveraged for credential harvesting via phishing or malware distribution. Patches are available through IBM support.

## Affected products

- IBM Common Licensing Agent 9.0, 9.0.0.1, 9.0.0.2
- IBM License Key Server Administration and Reporting Tool (ART) 9.0, 9.0.0.1, 9.0.0.2

## Timeline

- 2026-09-10: disclosed

## References

- [https://www.ibm.com/support/pages/node/7286490](https://www.ibm.com/support/pages/node/7286490)

## Related threats

- [IBM Common Licensing Agent cross-site scripting in Web UI](https://junglewise.ai/threats/cve-2026-1037-ibm-common-licensing-agent-9-0-agent-9-0-0-1-agent-9-0-0-2-art-9-0)
- [IBM Common Licensing Agent cross-site scripting in Web UI](https://junglewise.ai/threats/cve-2026-1031-ibm-common-licensing-agent-9-0-agent-9-0-0-1-agent-9-0-0-2-art-9-0)
- [IBM Common Licensing Agent information disclosure in error messages](https://junglewise.ai/threats/cve-2026-1030-ibm-common-licensing-agent-9-0-agent-9-0-0-1-agent-9-0-0-2-art-9-0)
- [IBM Common Licensing Agent cross-site scripting in Web UI](https://junglewise.ai/threats/cve-2026-1029-ibm-common-licensing-agent-9-0-agent-9-0-0-1-agent-9-0-0-2-art-9-0)
- [IBM Common Licensing Agent cross-site scripting in Web UI](https://junglewise.ai/threats/cve-2026-1025-ibm-common-licensing-agent-9-0-agent-9-0-0-1-agent-9-0-0-2-art-9-0)