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TI-2026-11600 Aliases CVE-2026-13759GHSA-xw6m-6cgm-v7qm

IBM WebSphere eXtreme Scale is affected by Insecure Deserilization

Priority MEDIUM 41CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-502.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00546 46th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
IBMWebSphere Extreme Scale8.6.1.0 – 8.6.1.6—No fix listedCNA
  • WebSphere Extreme Scale VendorIBM Affected 8.6.1.0 – 8.6.1.6 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:*8.6.1.0 – 8.6.1.6VulnerableIBM
  • cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:* Versions 8.6.1.0 – 8.6.1.6 Vulnerable ·IBM

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-13759
  2. 2026-10-03 Alias added: GHSA-xw6m-6cgm-v7qm

References

Patch 1

  • TI-2026-11613 IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol CVSS 3.1CRITICAL 10.0
  • TI-2026-11612 IBM WebSphere eXtreme Scale's OQL is affected by remote code execution CVSS 3.1CRITICAL 9.9
  • TI-2013-04605 The monitoring console in IBM WebSphere eXtreme Scale 7.1.0, 7.1.1, 8.5.0, and 8.6.0 does… CVSS 2.0HIGH 7.5
  • TI-2016-00354 CRLF injection vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3, 7.1.1… CVSS 3.0MEDIUM 6.1
  • TI-2019-03073 Clickjacking in IBM WebSphere eXtreme Scale CVSS 3.1MEDIUM 6.1
  • TI-2026-07915 IBM WebSphere eXtremes Scale is affected by uncontrolled resource consumption when XDF is enabled CVSS 3.1MEDIUM 6.5
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences