PT-2026-53942 · Ibm · Ibm Websphere Extreme Scale
Published
2026-06-30
·
Updated
2026-06-30
·
CVE-2026-13759
CVSS v3.1
7.5
High
| Vector | AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
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
Fix
Deserialization of Untrusted Data
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Weakness Enumeration
Related Identifiers
Affected Products
Ibm Websphere Extreme Scale