What is CVE-2026-17309?

CVE-2026-17309 is a high-severity vulnerability in IBM API Connect, classified under Improper Certificate Validation. CVSS score: 8.0/10. Published 2026-11-07.

How severe is CVE-2026-17309?

High severity. CVSS v3 base score is 8.0 out of 10.

Vulnerability in IBM API Connect

CVE-2026-17309

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote attacker to obtain sensitive information and tamper with configuration due to improper certificate validation.

Vulnerability class: Improper Certificate Validation

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

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/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-295 — Improper Certificate Validation

References

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

Frequently asked questions

What is CVE-2026-17309?: CVE-2026-17309 is a high-severity vulnerability in IBM API Connect, classified under Improper Certificate Validation. CVSS score: 8.0/10. Published 2026-11-07.
How severe is CVE-2026-17309?: High severity. CVSS v3 base score is 8.0 out of 10.