Is CVE-2026-18505 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18505?

CVE-2026-18505 has a CVSS v3 severity of MEDIUM (5.4).

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CVE-2026-18505

Description

IBM Financial Transaction Manager (FTM) for RedHat OpenShift is vulnerable to open redirect in the PMP `HostHeaderFilter` (`HostHeaderFilter.java:151`). An unauthenticated attacker can craft a request with a manipulated `Host` header to redirect authenticated operators to attacker-controlled sites, enabling credential phishing.