What is CVE-2026-18689?

CVE-2026-18689 is a medium-severity vulnerability in IBM API Connect, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-11-07.

How severe is CVE-2026-18689?

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

Auth bypass in IBM API Connect

CVE-2026-18689

IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow an authenticated user to obtain limited information about other organizations due to incorrect authorization. A token issued for a limited purpose is accepted where it should not be, which could reveal the names of other organizations.

Vulnerability class: Broken Access Control

Published 2026-11-07 · last modified 2026-11-08.

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 API Connect

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

www.ibm.com/support/pages/node/7295635 (vendor-advisory, patch)
www.ibm.com/support/pages/node/7295637 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-18689?: CVE-2026-18689 is a medium-severity vulnerability in IBM API Connect, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-11-07.
How severe is CVE-2026-18689?: Medium severity. CVSS v3 base score is 4.3 out of 10.