Auth bypass in IBM Financial Transaction Manager

CVE-2026-18156

IBM Financial Transaction Manager (FTM) for RedHat OpenShift could allow a remote authenticated attacker to bypass security controls by forging user identities due to improper authorization.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-18156: held from 0.002 to 0.004.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18156?
CVE-2026-18156 is a medium-severity vulnerability in IBM Financial Transaction Manager, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-22.
How severe is CVE-2026-18156?
Medium severity. CVSS v3 base score is 6.5 out of 10.