What is CVE-2026-19121?

CVE-2026-19121 is a high-severity vulnerability in IBM API Connect, classified under Authentication Bypass by Spoofing. CVSS score: 8.3/10. Published 2026-11-07.

How severe is CVE-2026-19121?

High severity. CVSS v3 base score is 8.3 out of 10.

Vulnerability in IBM API Connect

CVE-2026-19121

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow an authenticated attacker to gain unauthorized access due to improper authorization. Tenant context is not sufficiently verified against the authenticated user, which could allow access to another tenant's resources.

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

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-290 — Authentication Bypass by Spoofing

References

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

Frequently asked questions

What is CVE-2026-19121?: CVE-2026-19121 is a high-severity vulnerability in IBM API Connect, classified under Authentication Bypass by Spoofing. CVSS score: 8.3/10. Published 2026-11-07.
How severe is CVE-2026-19121?: High severity. CVSS v3 base score is 8.3 out of 10.