High severity · published Aug 12, 2026
CVE-2026-18499
IBM WebSphere Application Server Liberty is affected by a privilege escalation
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 is vulnerable to a privilege escalation when using Liberty collectives.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WebSphere Application Server - Liberty · IBM
17.0.0.3 through 26.0.0.8 · source: vendor
WA
Websphere Application Server · Ibm
17.0.0.3 before 26.0.0.9 · source: NVD
Affected product
WA
WebSphere Application Server - Liberty
IBM
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18499
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18499
Vendor Advisory
https://www.ibm.com/support/pages/node/7283489
More from WebSphere Application Server - Liberty
9.8
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
CVE-2026-14529
IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by a server-side request forgery
9.8
CVE-2026-14976
IBM WebSphere Application Server Liberty is affected by a remote code execution and path-segment injection vulnerability
9.8
CVE-2026-11546
IBM WebSphere Application Server Liberty is affected by a server-side request forgery vulnerability
9.8
CVE-2026-11714
IBM WebSphere Application Server Liberty is affected by an authorization bypass vulnerability