Medium severity · published Oct 13, 2026
CVE-2026-77816
IBM WebSphere Application Server Liberty Improper Certificate Validation
6.5
CVSS
0.2%
EPSS
No
On KEV
Description
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.9 administrative client could allow man-in-the-middle attacks. An attacker could exploit this vulnerability to obtain sensitive information.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% 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 26.0.0.9 · source: vendor
Affected product
WA
WebSphere Application Server - Liberty
IBM
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77816
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77816
vendor-advisory
https://www.ibm.com/support/pages/node/7291394
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