# CVE-2026-6327: IBM Concert log injection vulnerability

Source: https://junglewise.ai/threats/cve-2026-6327-ibm-concert-1-0-0-through-3-0-0-could-allow-an-unauthorized-user  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-23. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-6327 · Severity: medium · CVSS 4.3 · Published 2026-09-23

IBM Concert, a software platform used for enterprise applications, contains a log injection flaw that allows unauthorized users to insert arbitrary data into application logs. An attacker could manipulate log records to hide malicious activity, forge audit trails, or trigger downstream systems that parse logs without proper validation, potentially leading to account compromise or system disruption.

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

## Quick answers

**Is CVE-2026-6327 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6327 being exploited in the wild.

**How severe is CVE-2026-6327?** Medium severity, with a CVSS score of 4.3, 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-2026-6327?** 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-2026-6327 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-6327?** 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

The vulnerability stems from improper neutralization of special characters when writing user-controlled data to log files. An unauthenticated attacker can inject specially-crafted input that is written to logs without sanitization, enabling log injection attacks. The affected component does not implement escape or encoding mechanisms for log output, allowing attackers to inject newlines and other control characters to forge log entries.

## Affected products

- IBM Concert 1.0.0 through 3.0.0

## Timeline

- 2026-09-23: disclosed

## References

- [https://www.ibm.com/support/pages/node/7288830](https://www.ibm.com/support/pages/node/7288830)

## 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 arbitrary command execution in dependencies](https://junglewise.ai/threats/cve-2026-15266-ibm-concert-1-0-through-3-0-1-1-contains-components-that-allow)
- [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)