What is GHSA-xw6m-6cgm-v7qm?

GHSA-xw6m-6cgm-v7qm is a security advisory published by GitHub Security Advisories with High severity. IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses ...

Which CVE IDs does GHSA-xw6m-6cgm-v7qm cover?

GHSA-xw6m-6cgm-v7qm covers the following CVE IDs: CVE-2026-13759. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-xw6m-6cgm-v7qm?

GHSA-xw6m-6cgm-v7qm has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-xw6m-6cgm-v7qmHighCVSS 7.5

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses ...

Vendor

GitHub Security Advisories

Published

June 30, 2026

Last Modified

June 30, 2026

🔗 CVE IDs covered (1)

CVE-2026-13759 →

📋 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

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-13759
https://www.ibm.com/support/pages/node/7278595
https://github.com/advisories/GHSA-xw6m-6cgm-v7qm