CVE-2026-13773

Websphere Extreme Scale vulnerability

CVSS

6.0

EPSS

3.4%

EPSS pct

88th

Exploited

No known

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.

Affected vendor

Ibm

Affected product

Websphere Extreme Scale

CVSS vector

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

Weakness type (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Published

2026-06-30

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity, low impact to availability.

Its EPSS score of 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2026-13773

Confirm whether Ibm Websphere Extreme Scale is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2026-13773.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-13773

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