CVE-2026-3628 Overview
CVE-2026-3628 is an information disclosure vulnerability in IBM Concert versions 1.0 through 3.0.0. The flaw exposes schema suggestions to unauthenticated network attackers, revealing internal data structure details that should remain private. The weakness is categorized under [CWE-209], Generation of Error Message Containing Sensitive Information.
An attacker with network access to an affected IBM Concert instance can observe schema-related suggestions returned by the application. These suggestions can leak details about underlying data models, field names, and backend structures. Attackers can use the exposed information to plan follow-on attacks against the system or connected services.
Critical Impact
Unauthenticated remote attackers can retrieve schema suggestion data from IBM Concert, aiding reconnaissance for further exploitation.
Affected Products
- IBM Concert 1.0
- IBM Concert 2.x
- IBM Concert 3.0.0
Discovery Timeline
- 2026-10-19 - CVE-2026-3628 published to NVD
- 2026-10-22 - Last updated in NVD database
Technical Details for CVE-2026-3628
Vulnerability Analysis
IBM Concert is a software operations and compliance platform. The vulnerability resides in functionality that returns schema suggestions to clients during normal interaction with the application. Instead of restricting these responses to authorized users, the service returns structural metadata that should not be exposed.
The weakness falls under [CWE-209], which covers cases where applications include sensitive internal details in responses or error output. In this instance, the leaked data describes schema fields that back the application's data model. Attackers can issue standard network requests to the exposed endpoints and parse the responses for sensitive identifiers.
The disclosure does not compromise integrity or availability directly. However, it reduces the barrier to crafting targeted attacks against downstream components. Reconnaissance activity of this nature is often the first stage of a broader intrusion attempt.
Root Cause
The application returns schema suggestion data without enforcing adequate authorization or output filtering. Internal structural details reach the response body, where any network-connected client can read them. Refer to the IBM Support Page for vendor-provided technical specifics.
Attack Vector
The attack vector is network-based and requires no authentication or user interaction. An attacker sends crafted requests to an exposed IBM Concert endpoint and reads schema data from the response. No specialized tooling is required beyond a standard HTTP client.
No public proof-of-concept exploit has been published for CVE-2026-3628, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability stands at 0.33%.
Detection Methods for CVE-2026-3628
Indicators of Compromise
- Unexpected outbound responses from IBM Concert containing schema field names or metadata to external clients.
- Repeated unauthenticated requests to IBM Concert API endpoints associated with schema or suggestion functionality.
- Access logs showing enumeration patterns against Concert endpoints from unfamiliar source IP addresses.
Detection Strategies
- Inspect web server and application logs for requests to schema or suggestion endpoints originating from untrusted networks.
- Correlate authentication logs with API access logs to identify unauthenticated reads of schema data.
- Deploy response content inspection to flag API responses containing structural metadata leaving the environment.
Monitoring Recommendations
- Monitor IBM Concert application logs for abnormal request volume against endpoints that return suggestions.
- Enable network traffic analytics on segments hosting IBM Concert to identify reconnaissance patterns.
- Alert on access to Concert management interfaces from source addresses outside approved administrative ranges.
How to Mitigate CVE-2026-3628
Immediate Actions Required
- Identify all IBM Concert deployments running versions 1.0 through 3.0.0 and inventory their network exposure.
- Restrict network access to IBM Concert interfaces so that only authorized users and services can reach them.
- Review access logs for any prior unauthenticated requests to schema-related endpoints.
- Apply the vendor patch referenced on the IBM Support Page once available in your environment.
Patch Information
IBM has published guidance for CVE-2026-3628 on its support portal. Administrators should consult the IBM Support Page for the fixed version information and upgrade instructions applicable to their deployment of IBM Concert.
Workarounds
- Place IBM Concert behind an authenticating reverse proxy or web application firewall that blocks unauthenticated access to API endpoints.
- Limit inbound access to Concert services through network segmentation and allowlisted source IP ranges.
- Disable or restrict schema suggestion functionality where configuration permits until the patch is applied.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
