What is CVE-2026-8620?

CVE-2026-8620 is a high-severity vulnerability in Ibm Web Server Plug-ins For Websphere Application And Liberty, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2026-05-26.

How severe is CVE-2026-8620?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Ibm Web Server Plug-ins For Websphere Application And Liberty

CVE-2026-8620

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…

Vulnerability class: HTTP Request Smuggling

EPSS: 0.001 (21.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N.

Affected products

Ibm Web Server Plug-ins For Websphere Application And Liberty — versions 8.5, 9.0
Ibm Websphere_application_server

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

psirt@us.ibm.com (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8620?: CVE-2026-8620 is a high-severity vulnerability in Ibm Web Server Plug-ins For Websphere Application And Liberty, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2026-05-26.
How severe is CVE-2026-8620?: High severity. CVSS v3 base score is 7.5 out of 10.