Security Bulletin
Summary
IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities.
Vulnerability Details
CVEID: CVE-2026-16190
DESCRIPTION: IBM WebSphere Application Server is affected by an authorization bypass vulnerability.
CWE: CWE-862: Missing Authorization
CVSS Source: IBM
CVSS Base score: 3.1
CVSS Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-15887
DESCRIPTION: IBM WebSphere Application Server is affected by blind server-side request forgery when processing SOAP requests.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 5.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-15412
DESCRIPTION: IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty could allow a remote attacker to conduct phishing attacks, using an open redirect attack. By persuading a victim to visit a specially crafted Web site, a remote attacker could exploit this vulnerability to spoof the URL displayed to redirect a user to a malicious Web site that would appear to be trusted. This could allow the attacker to obtain highly sensitive information or conduct further attacks against the victim.
CWE: CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-16435
DESCRIPTION: IBM WebSphere Application Server is affected by an authentication bypass vulnerability when using XD or Intelligent-Management features.
CWE: CWE-650: Trusting HTTP Permission Methods on the Server Side
CVSS Source: IBM
CVSS Base score: 5.9
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2026-15396
DESCRIPTION: IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
CWE: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-15634
DESCRIPTION: IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
CWE: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-16185
DESCRIPTION: IBM WebSphere Application Server could allow a remote attacker to bypass authentication on an admin console servlet.
CWE: CWE-862: Missing Authorization
CVSS Source: IBM
CVSS Base score: 6.4
CVSS Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H)
CVEID: CVE-2026-10841
DESCRIPTION: IBM WebSphere Application Server 8.5, 9.0, and Liberty are vulnerable to HTTP request smuggling.
CWE: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS Source: IBM
CVSS Base score: 4.2
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-11548
DESCRIPTION: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by an HTTP request smuggling vulnerability.
CWE: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS Source: IBM
CVSS Base score: 4.8
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-11549
DESCRIPTION: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by a virtual host bypass vulnerability.
CWE: CWE-284: Improper Access Control
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-11722
DESCRIPTION: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by an HTTP request smuggling vulnerability.
CWE: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-9327
DESCRIPTION: IBM WebSphere Application Server could allow an authenticated user with a low-privilege administrative role to modify security configuration. This could result in information disclosure or denial of service.
CWE: CWE-269: Improper Privilege Management
CVSS Source: IBM
CVSS Base score: 6.3
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H)
CVEID: CVE-2026-9667
DESCRIPTION: IBM WebSphere Application Server is vulnerable to server-side request forgery (SSRF) that could allow a remote, unauthenticated attacker to cause the server to send outbound requests to arbitrary endpoints.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 5.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-9338
DESCRIPTION: IBM WebSphere Application Server is vulnerable to a denial of service, caused by sending a specially-crafted request. A remote attacker could exploit this vulnerability to trigger excessive resource consumption, potentially leading to reduced availability of the affected service.
CWE: CWE-400: Uncontrolled Resource Consumption
CVSS Source: IBM
CVSS Base score: 5.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2026-16188
DESCRIPTION: IBM WebSphere Application Server could allow a remote attacker to inject forged log entries into the server's administrative log.
CWE: CWE-117: Improper Output Neutralization for Logs
CVSS Source: IBM
CVSS Base score: 5.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2026-9176
DESCRIPTION: IBM WebSphere Application Server is vulnerable to a security bypass due to improper authentication controls. A local attacker could exploit this vulnerability to escalate privileges and gain unauthorized access to protected resources.
CWE: CWE-94: Improper Control of Generation of Code ('Code Injection')
CVSS Source: IBM
CVSS Base score: 6.7
CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
CVEID: CVE-2026-11540
DESCRIPTION: IBM WebSphere Application Server could allow a remote attacker to obtain sensitive information about the file system through the FileTransfer servlet.
CWE: CWE-863: Incorrect Authorization
CVSS Source: IBM
CVSS Base score: 5.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-11539
DESCRIPTION: IBM WebSphere Application Server is affected by an authentication bypass vulnerability in the SOAP/JMX connector.
CWE: CWE-306: Missing Authentication for Critical Function
CVSS Source: IBM
CVSS Base score: 5.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-11538
DESCRIPTION: IBM WebSphere Application Server is affected by a log injection vulnerability through crafted LTPA token cookies.
CWE: CWE-117: Improper Output Neutralization for Logs
CVSS Source: IBM
CVSS Base score: 3.7
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2026-11711
DESCRIPTION: IBM WebSphere Application Server is affected by a deserialization vulnerability in the Name Service component.
CWE: CWE-502: Deserialization of Untrusted Data
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2026-16186
DESCRIPTION: IBM WebSphere Application Server is affected by a reflected cross-site scripting vulnerability.
CWE: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source: IBM
CVSS Base score: 5.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-16187
DESCRIPTION: IBM WebSphere Application Server could allow a remote attacker to bypass authentication and obtain sensitive information by sending a crafted unauthenticated request.
CWE: CWE-862: Missing Authorization
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2026-11537
DESCRIPTION: IBM WebSphere Application Server could allow a remote attacker to obtain sensitive information about the file system through the FileTransfer servlet.
CWE: CWE-650: Trusting HTTP Permission Methods on the Server Side
CVSS Source: IBM
CVSS Base score: 4.3
CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-16189
DESCRIPTION: IBM WebSphere Application Server could allow a remote attacker to inject forged log entries into the server's administrative log.
CWE: CWE-117: Improper Output Neutralization for Logs
CVSS Source: IBM
CVSS Base score: 4.8
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-9336
DESCRIPTION: IBM WebSphere Application Server is vulnerable to a denial of service, caused by sending a specially-crafted HTTP request to an administrative endpoint. A remote attacker could exploit this vulnerability to cause the server to exhaust filesystem space.
CWE: CWE-306: Missing Authentication for Critical Function
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| WebSphere Application Server | 9.0 |
| WebSphere Application Server | 8.5 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerabilities now by applying the fix pack(s) listed below.
For IBM WebSphere Application Server traditional:
For V9.0.0.0 through 9.0.5.28:
· Apply Fix Pack 9.0.5.29 (availability September 2026) or later fix pack.
For V8.5.0.0 through 8.5.5.30:
· Apply Fix Pack 8.5.5.31 (availability September 2026) or later fix pack.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
08 Sep 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
08 September 2026
Initial Publish date:
08 September 2026
UID
ibm17286610