CVE-2026-13773 IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol

Medium 6.0 Published 30 Jun 2026 Updated 30 Jun 2026

Attackers can trigger SSRF via ORB transport, potentially escalating to remote code execution on the JVM through chained deserialization flaws.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-13773?

CVE-2026-13773 is a medium-severity server-side request forgery vulnerability in IBM WebSphere Extreme Scale, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-918

Which versions are affected by CVE-2026-13773?

It affects 1 product.

Products include Ibm Websphere Extreme Scale.

How do I fix CVE-2026-13773?

No fix has been published for CVE-2026-13773 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-13773 being exploited?

There is no known exploitation of CVE-2026-13773 in the wild and no public exploit code.

Sources

Also known as GHSA-hgv4-prq7-c9mx.