What is CVE-2026-16884?

CVE-2026-16884 is a critical-severity vulnerability in IBM API Connect, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.9/10. Published 2026-11-07.

How severe is CVE-2026-16884?

Critical severity. CVSS v3 base score is 9.9 out of 10.

XXE in IBM API Connect

CVE-2026-16884

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote attacker to obtain sensitive information due to an XML external entity (XXE) injection.

Vulnerability class: XXE (XML External Entity)

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

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L.

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-611 — Improper Restriction of XML External Entity Reference (XXE)

References

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

Frequently asked questions

What is CVE-2026-16884?: CVE-2026-16884 is a critical-severity vulnerability in IBM API Connect, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.9/10. Published 2026-11-07.
How severe is CVE-2026-16884?: Critical severity. CVSS v3 base score is 9.9 out of 10.