CVE-2026-11545 Overview
CVE-2026-11545 is an information disclosure vulnerability in IBM WebSphere Application Server versions 8.5 and 9.0. The flaw resides in the administrative console and stems from missing authorization checks [CWE-862]. A remote attacker can query the console to obtain sensitive information without proper authorization validation. The confidentiality impact is limited, and the vulnerability does not affect integrity or availability. Exploitation requires network access to the administrative console but does not require authentication or user interaction. Attack complexity is high, which reduces the practical exploitation surface.
Critical Impact
Remote attackers can retrieve limited sensitive information from the WebSphere administrative console without authenticating, potentially aiding reconnaissance for follow-on attacks.
Affected Products
- IBM WebSphere Application Server 8.5
- IBM WebSphere Application Server 9.0
- Deployments exposing the administrative console over the network
Discovery Timeline
- 2026-09-18 - CVE-2026-11545 published to the National Vulnerability Database
- 2026-09-22 - Last updated in NVD database
Technical Details for CVE-2026-11545
Vulnerability Analysis
The vulnerability affects the administrative console component of IBM WebSphere Application Server. The console fails to enforce authorization checks on specific request paths that expose sensitive data. Because authorization enforcement is missing rather than misconfigured, the flaw is present in default installations of the affected versions. The disclosed information is limited in scope but can support reconnaissance activities such as identifying deployed applications, configuration parameters, or environment details. Attackers can use this data to plan targeted attacks against the WebSphere instance or hosted applications. Refer to the IBM Support Documentation for vendor guidance and affected fix pack levels.
Root Cause
The root cause is a missing authorization check [CWE-862] on one or more administrative console request handlers. The affected handlers return response data without first verifying that the requesting principal holds the required administrative role. This design gap allows unauthenticated requests to reach code paths that should be restricted to authorized administrators.
Attack Vector
The attack vector is network-based. An attacker sends crafted HTTP or HTTPS requests to the WebSphere administrative console endpoint. No credentials or user interaction are required. Attack complexity is high because successful exploitation depends on specific request conditions and knowledge of the vulnerable endpoint. Environments that expose the administrative console to untrusted networks face the greatest risk.
No verified public exploit code is available for this vulnerability. See the IBM Support Documentation for technical details.
Detection Methods for CVE-2026-11545
Indicators of Compromise
- Unauthenticated HTTP or HTTPS requests to WebSphere administrative console paths from unexpected source addresses.
- Repeated access attempts to administrative console endpoints without valid session cookies.
- Access log entries showing successful responses to unauthenticated console requests.
Detection Strategies
- Review WebSphere access logs for requests to administrative console URIs originating outside authorized management networks.
- Correlate console access events with authentication logs to identify unauthenticated requests receiving non-error responses.
- Establish baselines for normal administrative console traffic and alert on deviations.
Monitoring Recommendations
- Forward WebSphere and web server logs to a centralized SIEM for continuous analysis.
- Alert on any access to administrative console endpoints from networks that are not designated for administration.
- Monitor for scanning patterns targeting common WebSphere administrative paths and ports.
How to Mitigate CVE-2026-11545
Immediate Actions Required
- Restrict network access to the WebSphere administrative console to trusted management subnets only.
- Inventory IBM WebSphere Application Server 8.5 and 9.0 instances and confirm patch status.
- Enforce authentication for all administrative console traffic and disable anonymous access paths.
Patch Information
IBM has published guidance and fix information in the IBM Support Documentation. Administrators should apply the interim fix or fix pack identified by IBM for WebSphere Application Server 8.5 and 9.0. Validate patch application in a test environment before production rollout.
Workarounds
- Place the administrative console behind a reverse proxy or firewall that requires client authentication.
- Bind the administrative console listener to management-only network interfaces.
- Disable the administrative console on production nodes where it is not required for daily operations.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.