What is CVE-2026-15328?

CVE-2026-15328 is a high-severity vulnerability in IBM Websphere Application Server, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.4/10. Published 2026-07-28.

How severe is CVE-2026-15328?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in IBM Websphere Application Server

CVE-2026-15328

IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to HTTP request smuggling.

Vulnerability class: HTTP Request Smuggling

EPSS: 0.002 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Ibm Websphere Application Server — versions 9.0, 8.5
Ibm Websphere_application_server
Ibm Websphere Application Server - Liberty — versions 17.0.0.3

Weakness classification (CWE)

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

References

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

Frequently asked questions

What is CVE-2026-15328?: CVE-2026-15328 is a high-severity vulnerability in IBM Websphere Application Server, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.4/10. Published 2026-07-28.
How severe is CVE-2026-15328?: High severity. CVSS v3 base score is 7.4 out of 10.