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Critical severity · published Jun 22, 2026
CVE-2026-8646
IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities
9.1
CVSS
0.6%
EPSS
No
On KEV
Description
IBM WebSphere Application Server 9.0 and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to HTTP request smuggling. A remote attacker could smuggle a specially crafted request to the application server thereby allowing the attacker to bypass security controls, spoof identity, escalate privilege, and expose sensitive information.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WebSphere Application Server · IBM
9.0.0 through 7.0.2 Interim Fix 035; 8.5.0 through 7.0.3 Interim Fix 017 · source: vendor, NVD
WA
WebSphere Application Server - Liberty · IBM
17.0.0.3 through 26.0.0.6 · source: vendor
Affected product
WA
WebSphere Application Server
IBM
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8646
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8646
Vendor Advisory
https://www.ibm.com/support/pages/node/7276579
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