Critical severity · published Aug 5, 2026
CVE-2026-8400
Multiple Vulnerabilities in IBM® Java SDK affect IBM WebSphere Application Server and WebSphere Application Server Liberty due to the July 2026 CPU
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and instantation of arbitrary classes.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WebSphere Application Server · IBM
8.5; 9.0 · source: vendor, NVD
WA
WebSphere Application Server - Liberty · IBM
Continuous delivery · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8400
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8400
Vendor Advisory
https://www.ibm.com/support/pages/node/7282446
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