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 affected by an HTTP request smuggling vulnerability.
Published: 2026-06-30
Score: 7.4 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

IBM WebSphere Application Server 9.0, 8.5, and WebSphere Application Server – Liberty versions 17.0.0.3 through 26.0.0.6 contain an HTTP request smuggling flaw that can let attackers manipulate the way the server parses HTTP requests, potentially causing tampering of request data and compromising the integrity of the application. This weakness corresponds to CWE‑444 and may allow an attacker to alter or discard parts of a request or response.

Affected Systems

The affected servers are IBM WebSphere Application Server 8.5.0.0 through 8.5.5.30 and 9.0.0.0 through 9.0.5.28, and IBM WebSphere Application Server – Liberty in versions 17.0.0.3 through 26.0.0.6.

Risk and Exploitability

The CVSS score of 7.4 indicates high severity, although the EPSS score is not available and the vulnerability is not listed in CISA’s KEV catalog. Based on the description, the likely attack vector is remote: an attacker only needs to send crafted HTTP traffic to the affected server. If the flaw is successfully exploited, the outcome could be manipulation of request handling, potentially leading to unauthorized data access or service disruption, depending on other existing weaknesses.

Generated by OpenCVE AI on June 30, 2026 at 23:32 UTC.

Remediation

Vendor Solution

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71808 and PH71706.  For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.6: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71808 https://www.ibm.com/support/pages/node/7277460 --OR-- · Apply Fix Pack 26.0.0.7 or later (targeted availability 3Q2026). For IBM WebSphere Application Server traditional: For V9.0.0.0 through 9.0.5.28: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71706 https://www.ibm.com/support/pages/node/7277463 --OR-- · Apply Fix Pack 9.0.5.29 or later (targeted availability 3Q2026).  For V8.5.0.0 through 8.5.5.30: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71706 https://www.ibm.com/support/pages/node/7277463 --OR-- · Apply Fix Pack 8.5.5.31 or later (targeted availability 3Q2026).  Additional interim fixes may be available and linked off the interim fix download page.

OpenCVE Recommended Actions

  • Apply interim fix PH71706 for WebSphere Application Server traditional or PH71808 for Liberty after installing any required minimal fix packs.
  • Upgrade to the latest fix pack that includes the remediation, such as WebSphere Application Server Liberty 26.0.0.7 or later, or WebSphere Application Server 9.0.5.29 or later, or 8.5.5.31 or later, following vendor guidance.
  • If immediate patching is not possible, implement network controls that enforce strict HTTP request parsing policies to reduce potential exploitation.

Generated by OpenCVE AI on June 30, 2026 at 23:32 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 01 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 30 Jun 2026 21:30:00 +0000

Type Values Removed Values Added
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 affected by an HTTP request smuggling vulnerability.
Title IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by HTTP request smuggling
First Time appeared Ibm
Ibm websphere Application Server
Ibm websphere Application Server Liberty
Weaknesses CWE-444
CPEs cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server___liberty:17.0.0.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server___liberty:26.0.0.6:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm websphere Application Server
Ibm websphere Application Server Liberty
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Subscriptions

Ibm Websphere Application Server Websphere Application Server Liberty
cve-icon MITRE

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-07-01T14:52:15.909Z

Reserved: 2026-06-08T02:55:08.653Z

Link: CVE-2026-11541

cve-icon Vulnrichment

Updated: 2026-07-01T14:52:11.835Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-01T04:45:05Z

Weaknesses
  • CWE-444

    Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')