# CVE-2026-18505: IBM Financial Transaction Manager open redirect in HostHeaderFilter

Source: https://junglewise.ai/threats/cve-2026-18505-ibm-financial-transaction-manager-ftm-for-redhat-openshift-is  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-23. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-18505 · Severity: medium · CVSS 5.4 · Published 2026-09-23

IBM Financial Transaction Manager (FTM) is a financial transaction processing system used by enterprises to manage payment flows and banking operations. An unauthenticated attacker can manipulate HTTP requests to trick authenticated users into visiting malicious websites, potentially compromising operator credentials through phishing attacks. This vulnerability requires user interaction but can lead to account compromise and data theft from authorized system operators.

Technologies: [IBM Financial Transaction Manager](https://junglewise.ai/threats/technologies/financial-transaction-manager). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-18505 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18505 being exploited in the wild.

**How severe is CVE-2026-18505?** Medium severity, with a CVSS score of 5.4, published 23 September 2026.

**Which products and versions are affected?** IBM Financial Transaction Manager 4.x.

**Is there a fix for CVE-2026-18505?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-18505 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-18505?** Check whether you run IBM Financial Transaction Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an open redirect (CWE-601) in the PMP HostHeaderFilter component (HostHeaderFilter.java:151) that fails to validate the Host header before performing redirects. An unauthenticated attacker can craft a request with a malicious Host header to redirect authenticated operators to attacker-controlled sites. Exploitation requires the victim to click a malicious link, but enables credential phishing against privileged users.

## Affected products

- IBM Financial Transaction Manager 4.x

## Timeline

- 2026-09-23: disclosed

## References

- [https://www.ibm.com/support/pages/node/7288641](https://www.ibm.com/support/pages/node/7288641)

## Related threats

- [IBM Financial Transaction Manager XML external entity injection](https://junglewise.ai/threats/cve-2026-93030-ftm-4-x-all-could-allow-a-remote-authenticated-attacker-to-obtain)
- [IBM Financial Transaction Manager missing authentication in Business Rules Manager](https://junglewise.ai/threats/cve-2026-19267-ibm-financial-transaction-manager-ftm-for-redhat-openshift-is)
- [IBM Financial Transaction Manager boolean-based SQL injection](https://junglewise.ai/threats/cve-2026-19179-ibm-financial-transaction-manager-ftm-for-redhat-openshift-could)
- [IBM Financial Transaction Manager privilege escalation in container](https://junglewise.ai/threats/cve-2026-19087-ibm-financial-transaction-manager-ftm-for-redhat-openshift-could)
- [IBM Financial Transaction Manager RAG poisoning via unauthenticated runbook](https://junglewise.ai/threats/cve-2026-18875-ibm-financial-transaction-manager-ftm-for-redhat-openshift-is)