What is CVE-2026-6327?

CVE-2026-6327 is a medium-severity vulnerability in IBM Concert, classified under Improper Output Neutralization for Logs. CVSS score: 4.3/10. Published 2026-09-23.

How severe is CVE-2026-6327?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in IBM Concert

CVE-2026-6327

IBM Concert 1.0.0 through 3.0.0 could allow an unauthorized user to inject data into log messages due to improper neutralization of special elements when written to log files.

Published 2026-09-23 · last modified 2026-09-28.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.9th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

IBM Concert

Weakness classification (CWE)

CWE-117 — Improper Output Neutralization for Logs

References

www.ibm.com/support/pages/node/7288830 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-6327?: CVE-2026-6327 is a medium-severity vulnerability in IBM Concert, classified under Improper Output Neutralization for Logs. CVSS score: 4.3/10. Published 2026-09-23.
How severe is CVE-2026-6327?: Medium severity. CVSS v3 base score is 4.3 out of 10.