CVE-2026-18490 IBM Financial Transaction Manager (FTM) is Impacted by Multiple Vulnerabilities

High 8.8 Published 23 Sep 2026 Updated 23 Sep 2026

Unauthenticated remote attackers can execute arbitrary code via Java deserialization in IBM FTM, exposing credentials and allowing manipulation of payment rules.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-18490?

CVE-2026-18490 is a high-severity unsafe deserialization vulnerability in Ibm Financial Transaction Manager, published on 23 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-502

Which versions are affected by CVE-2026-18490?

It affects 1 product.

Products include Ibm Financial Transaction Manager.

How do I fix CVE-2026-18490?

No fix has been published for CVE-2026-18490 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-18490 being exploited?

There is no known exploitation of CVE-2026-18490 in the wild and no public exploit code.

All Ibm Financial Transaction Manager vulnerabilities

Sources

Also known as GHSA-5p47-frcm-v44p.