CVE-2026-13759

CVSS Score & Metrics

Base Score

7.5 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H                                    

Vulnerability Description

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs

Vulnerability Details

Published Date

June 30, 2026

Last Modified

June 30, 2026

CWE ID

CWE-502

Source

NVD

Vendor

IBM

Product

WebSphere Extreme Scale

External References

https://www.ibm.com/support/pages/node/7278595

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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