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CVE-2026-13773: ibm websphere_extreme_scale Server-Side Request Forgery (SSRF)

CVSS: 10.0v3.1CriticalAnalyzed
Published 30-06-2026Last modified 30-06-2026
Open JSON

Vulnerability summary

CVE-2026-13773 is a critical (CVSS 10.0) Server-Side Request Forgery (SSRF) vulnerability in ibm websphere_extreme_scale. EPSS estimates a 6.10% chance of exploitation in the next 30 days, higher than 93.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.1 (NVD)
EPSS score
6.10%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-06-2026
    PublishedVulnerability first disclosed.
  2. 30-06-2026
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

6.10%

Chance of exploitation in the next 30 days

Percentile

93%

Versus all other CVEs

30-day change

0.00 pp

From 6.10% on 20-09-2026

20-09-202620-10-2026
EPSS score
6.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ibm1 product

1 vendor · 1 product

References

1 links