IBM WebSphere Extreme Scale up to 8.6.1.6 ogclient.jar ORB.string_to_object server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in IBM WebSphere Extreme Scale up to 8.6.1.6. Impacted is the function ORB.string_to_object of the file ogclient.jar. Performing a manipulation results in server-side request forgery. This vulnerability is reported as CVE-2026-13773. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in IBM WebSphere Extreme Scale up to 8.6.1.6. This affects the function ORB.string_to_object of the file ogclient.jar. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at ibm.com. This vulnerability is uniquely identified as CVE-2026-13773 since 06/29/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/01/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Application Server Software

Vendor

• IBM

Name

• WebSphere Extreme Scale

Version

• 8.6.1.0
• 8.6.1.1
• 8.6.1.2
• 8.6.1.3
• 8.6.1.4
• 8.6.1.5
• 8.6.1.6

License

• commercial

Website

• Vendor: https://www.ibm.com/

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