Auth bypass in IBM I

CVE-2026-17488

IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote authenticated attacker to bypass security restrictions due to improper authentication.

Vulnerability class: Broken Authentication

Published 2026-10-16 · last modified 2026-10-16.

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:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM I — versions 7.3, 7.4, 7.5

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.ibm.com/support/pages/node/7292270 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-17488?: CVE-2026-17488 is a medium-severity vulnerability in IBM I, classified under Improper Authentication. CVSS score: 4.3/10. Published 2026-10-16.
How severe is CVE-2026-17488?: Medium severity. CVSS v3 base score is 4.3 out of 10.