CVE-2026-15412 IBM CVE debrief

Who should care

Defenders responsible for WebSphere Application Server and WebSphere Application Server - Liberty instances, especially those exposed to the internet or untrusted networks, should assess exposure and prioritize patching.

Why it matters

CVE-2026-15412 is a medium-severity vulnerability in IBM WebSphere Application Server and WebSphere Application Server - Liberty, allowing remote attackers to conduct phishing attacks using open redirect attacks. Defenders should prioritize verifying exposure, applying patches, and implementing compensating controls.

• Phishing attacks could lead to sensitive information disclosure
• Attackers could conduct further attacks against the victim
• Defenders need to verify exposure and apply patches
• Compensating controls such as web application firewalls may be necessary

Technical summary

IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to an open redirect attack. A remote attacker could exploit this vulnerability to conduct phishing attacks by persuading a victim to visit a specially crafted website. This vulnerability allows remote attackers to conduct phishing attacks using open redirect attacks. Defenders should prioritize verifying exposure of WebSphere Application Server and WebSphere Application Server - Liberty instances, especially those exposed to the internet or untrusted networks.

Defensive priority

Defenders should prioritize verifying exposure of WebSphere Application Server and WebSphere Application Server - Liberty instances, especially those exposed to the internet or untrusted networks.

Recommended defensive actions

• Verify exposure of WebSphere Application Server and WebSphere Application Server - Liberty instances
• Apply patches from IBM support pages
• Monitor for suspicious activity
• Implement compensating controls such as web application firewalls
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on the vulnerability. IBM support pages offer vendor advisories and patches for affected products. The vulnerability allows remote attackers to conduct phishing attacks using open redirect attacks. Defenders should verify exposure of WebSphere Application Server and WebSphere Application Server - Liberty instances, especially those exposed to the internet or untrusted networks. The CVE record was published on 2026-09-14T20:08:05.955Z and has not been The

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.