Deserialization in IBM Financial Transaction Manager

CVE-2026-18490

IBM Financial Transaction Manager (FTM) for RedHat OpenShift is vulnerable to unauthenticated remote code execution via Java native deserialization on the PayDir Business Rules Manager RMI SSL endpoint (BrmRMISSLServerSocketFactory.java:95, EP8). An adjacent-network attacker can deliver a crafted serialized payload to achieve arbitrary code execution, exposing all PayDir credentials and enabling manipulation of payment business rules.

Vulnerability class: Insecure Deserialization

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.7% 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-2026-18490: rose from 0.003 to 0.008.

EPSS over last 30 days · oldest: 0.003 · newest: 0.008 · change: +0.005

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18490?
CVE-2026-18490 is a high-severity vulnerability in IBM Financial Transaction Manager, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-23.
How severe is CVE-2026-18490?
High severity. CVSS v3 base score is 8.8 out of 10.