What is CVE-2026-17391?

CVE-2026-17391 is a medium-severity vulnerability in IBM API Connect, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.3/10. Published 2026-11-07.

How severe is CVE-2026-17391?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Auth bypass in IBM API Connect

CVE-2026-17391

IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to obtain sensitive information due to broken object-level authorization.

Vulnerability class: IDOR (Insecure Direct Object Reference)

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

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (31.3th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

IBM API Connect

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

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-2026-17391?: CVE-2026-17391 is a medium-severity vulnerability in IBM API Connect, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.3/10. Published 2026-11-07.
How severe is CVE-2026-17391?: Medium severity. CVSS v3 base score is 6.3 out of 10.