IBM Financial Transaction Manager up to 4.0.10.0 RMI SSL endpoint BrmRMISSLServerSocketFactory.java deserialization

Summaryinfo

A vulnerability labeled as critical has been found in IBM Financial Transaction Manager up to 4.0.10.0. This issue affects some unknown processing of the file BrmRMISSLServerSocketFactory.java of the component RMI SSL endpoint. Executing a manipulation can lead to deserialization. This vulnerability is handled as CVE-2026-18490. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in IBM Financial Transaction Manager up to 4.0.10.0. This vulnerability affects an unknown part of the file BrmRMISSLServerSocketFactory.java of the component RMI SSL endpoint. The manipulation with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at ibm.com. This vulnerability was named CVE-2026-18490 since 07/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/23/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Financial Software

Vendor

• IBM

Name

• Financial Transaction Manager

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 4.0.7
• 4.0.8
• 4.0.9
• 4.0.10.0

License

• commercial

Website

• Vendor: https://www.ibm.com/

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