What is CVE-2026-17321?

CVE-2026-17321 is a high-severity vulnerability in IBM API Connect, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-11-07.

How severe is CVE-2026-17321?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in IBM API Connect

CVE-2026-17321

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to delete or overwrite arbitrary control-plane assets due to an insecure direct object reference.

Vulnerability class: IDOR (Insecure Direct Object Reference)

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

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.4th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.4% 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)

Frequently asked questions

What is CVE-2026-17321?: CVE-2026-17321 is a high-severity vulnerability in IBM API Connect, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-11-07.
How severe is CVE-2026-17321?: High severity. CVSS v3 base score is 8.1 out of 10.