CVE-2026-13773: CWE-918 Server-Side Request Forgery (SSRF) in IBM WebSphere Extreme Scale
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.
AI Analysis
Technical Summary
CVE-2026-13773 affects IBM WebSphere Extreme Scale 8.6.1.0, where about 50 CORBA stub classes in ogclient.jar invoke ORB.string_to_object() on attacker-controlled IOR strings during Java deserialization. This behavior allows an attacker to cause outbound IIOP SSRF requests to arbitrary hosts. If chained with the IBM ORB's getUserException class-instantiation vulnerability (WAS-26), this SSRF can lead to remote code execution on the calling JVM. The vulnerability is classified under CWE-918 (Server-Side Request Forgery). No patch or official remediation has been documented yet.
Potential Impact
The vulnerability allows an attacker to perform SSRF attacks from the server by controlling IOR strings during Java deserialization. This can lead to outbound requests to attacker-controlled hosts. When combined with a related IBM ORB vulnerability, it can escalate to remote code execution on the JVM running WebSphere Extreme Scale 8.6.1.0. The CVSS score of 6.0 indicates a medium severity impact with potential confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Until a patch is available, avoid exposing untrusted ObjectInputStream sinks or deserialization endpoints that process attacker-controlled input. Monitor IBM advisories for updates and apply patches promptly once released.
CVE-2026-13773: CWE-918 Server-Side Request Forgery (SSRF) in IBM WebSphere Extreme Scale
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.
CVSS v3.1
Score 6.0medium
Affected software
pkg:maven/com.ibm.websphere/websphere_extreme_scalecpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.6:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-13773 affects IBM WebSphere Extreme Scale 8.6.1.0, where about 50 CORBA stub classes in ogclient.jar invoke ORB.string_to_object() on attacker-controlled IOR strings during Java deserialization. This behavior allows an attacker to cause outbound IIOP SSRF requests to arbitrary hosts. If chained with the IBM ORB's getUserException class-instantiation vulnerability (WAS-26), this SSRF can lead to remote code execution on the calling JVM. The vulnerability is classified under CWE-918 (Server-Side Request Forgery). No patch or official remediation has been documented yet.
Potential Impact
The vulnerability allows an attacker to perform SSRF attacks from the server by controlling IOR strings during Java deserialization. This can lead to outbound requests to attacker-controlled hosts. When combined with a related IBM ORB vulnerability, it can escalate to remote code execution on the JVM running WebSphere Extreme Scale 8.6.1.0. The CVSS score of 6.0 indicates a medium severity impact with potential confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Until a patch is available, avoid exposing untrusted ObjectInputStream sinks or deserialization endpoints that process attacker-controlled input. Monitor IBM advisories for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-06-29T21:52:34.923Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a441ac027e9c7971948ab5f
Added to database: 06/30/2026, 19:36:32 UTC
Last enriched: 06/30/2026, 19:52:12 UTC
Last updated: 06/30/2026, 20:58:52 UTC
Views: 5
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