CVE-2026-13773

IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol

Published Jun 30, 2026 CVSS 3.1 · 6 Medium EPSS 6.1% KEV · Not listed
Description
IBM 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.string_to_object() on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound IIOP SSRF to an attacker-chosen host; when chained with the IBM ORB's getUserException class-instantiation flaw (WAS-26), this SSRF escalates to remote code execution on the calling JVM.

Remediation

Vendor Solution

Vulnerability is not applicable if Transport protocol is not Object Request Broker (ORB)  rather IBM eXtremeIO (XIO) .Please do not use ORB as transport protocol and use XIO as transport protocol. Please follow the below document for setting XIO as transport protocol https://www.ibm.com/docs/en/SSTVLU_8.6.1/com.ibm.websphere.extremescale.doc/txsconfigxstransport.html ORB is deprecated and we have removed ORB support from 8.6.2.* version . We recommend customers to migrate to 8.6.2.*.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description IBM 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.string_to_object() on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound IIOP SSRF to an attacker-chosen host; when chained with the IBM ORB's getUserException class-instantiation flaw (WAS-26), this SSRF escalates to remote code execution on the calling JVM.
Title IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol
First Time appeared Ibm
Ibm websphere Extreme Scale
Weaknesses CWE-918
CPEs cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.6:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm websphere Extreme Scale
References
Metrics cvssV3_1

{'score': 6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
ibm
Published
Updated
Jun 30, 2026, 7:37 PM
Reserved
Jun 29, 2026, 9:52 PM
Status
Analyzed
Published
Jun 30, 2026, 8:17 PM
Modified
Oct 25, 2026, 9:10 PM