← Vulnerability feed

Vulnerability record · CVE-2026-13759 · published 30 June 2026

CVE-2026-13759: Ibm websphere extreme scale deserialization of untrusted data vulnerability

Ibm · Websphere Extreme Scale

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

8.8 CVSS 3.1 High EPSS 0.55% · top 56.4% CWE-502 · Deserialization of untrusted data
8.8CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
3 Jul 2026Last modified by NVD

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.ibm.com/support/pages/node/7278595 Vendor Advisory

Track CVE-2026-13759 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-13773Ibm websphere extreme scale server-side request forgery (ssrf) vulnerabilityIBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.…EPSS 6.1%9.9CVE-2026-13772Ibm websphere extreme scale vulnerabilityIBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName() and in…EPSS 0.51%7.5CVE-2013-5393Ibm websphere extreme scale vulnerabilityThe monitoring console in IBM WebSphere eXtreme Scale 7.1.0, 7.1.1, 8.5.0, and 8.6.0 does not properly process logoff actions, which has unspecified …EPSS 1.3%6.5CVE-2026-9002Ibm websphere extreme scale uncontrolled resource consumption vulnerabilityIBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 could allow an adjacent attacker to cause a denial of service due to improper validation in the X…EPSS 0.27%6.1CVE-2019-4109Ibm websphere extreme scale clickjacking vulnerabilityIBM WebSphere eXtreme Scale 8.6 Admin Console could allow a remote attacker to hijack the clicking action of the victim. By persuading a victim to vi…EPSS 1.3%6.1CVE-2016-0400Ibm websphere extreme scale vulnerabilityCRLF injection vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3, 7.1.1 before 7.1.1.1, 8.5 before 8.5.0.3, and 8.6 before 8.6.0.8 al…EPSS 2.1%6.0CVE-2015-2026Ibm websphere extreme scale cross-site request forgery vulnerabilityCross-site request forgery (CSRF) vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 allows remote authentica…EPSS 0.54%5.4CVE-2019-4115Ibm websphere extreme scale cross-site scripting vulnerabilityIBM WebSphere eXtreme Scale 8.6 Admin API is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code i…EPSS 0.67%

Source: NIST National Vulnerability Database (record CVE-2026-13759), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.