Critical severity · published Jun 1, 2026
CVE-2026-9311
IBM WebSphere Application Server is affected by remote code execution
9.0
CVSS
0.5%
EPSS
No
On KEV
Description
IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WebSphere Application Server · IBM
9.0 through 1.1.9.12; 8.5 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9311
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9311
Vendor Advisory
https://www.ibm.com/support/pages/node/7274733
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