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High severity · published May 26, 2026
CVE-2026-8620
IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities when using when using Web Server Plug-ins
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM WebSphere Application Server and WebSphere Application Server Liberty are vulnerable to HTTP request smuggling in the Web Server Plug-ins through a specially crafted request.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WS
Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty · IBM
8.5, 9.0 through Interim Fix 002 · source: vendor
WA
Websphere Application Server · Ibm
8.5.0.0 before 8.5.5.30; 8.5.0.0 before 8.5.5.30; 9.0.0.0 before 9.0.5.28; 9.0.0.0 before 9.0.5.28 · source: NVD
Affected product
WS
Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty
IBM
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8620
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8620
Patch
https://www.ibm.com/support/pages/node/7274072
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IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities when using when using Web Server Plug-ins