CVE-2026-13773
CVSS v3
6
MEDIUM
EPSS Score
6.1 %
exploit probability, as of 2026-10-10
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Affected and fixed versions
Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-13773 yet.
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.
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
- Published
- 2026-06-30
- Last Modified
- 2026-07-01
Frequently asked questions
What is CVE-2026-13773?
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.
Is CVE-2026-13773 actively exploited?
Active exploitation of CVE-2026-13773 has not been confirmed. Its EPSS score was 6.1% on 2026-10-10, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-13773?
CVE-2026-13773 has a CVSS v3 base score of 6 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L.
Hear about the next vulnerability in your software
CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.
Already have an account? Open CVE Watch
No credit card required · 50 free checks/month · Free API key
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? CVE Watch alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.