IBM Concert CVE-2026-3628

Exploitation targets the schema suggestion functionality of IBM Concert versions 1.0 through 3.0.0; an attacker must be able to reach this feature over the network. Per the CVSS vector (AV:N/AC:L/PR:N/UI:N), no authentication or user interaction is required and exploitation works against affected default deployments, limited to leaking schema suggestion data (C:L) with no integrity or availability impact. The principal limiting factors are that the instance must be network-reachable (internet or intranet exposure) and that only an affected version (≤3.0.0) is running; the impact is confined to information disclosure useful mainly for reconnaissance. Note: the PR:N unauthenticated assumption should be confirmed against IBM's advisory, as management-tool features are often gated behind authentication.

This is a moderate-severity information disclosure flaw (CVSS 5.3) whose signals point to a low real-world priority rather than an urgent one. The CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates a network-reachable, low-complexity, unauthenticated issue requiring no user interaction, which raises exposure, but the impact is bounded to confidentiality only at a LOW level (C:L/I:N/A:N) - consistent with CWE-209 (information exposure, here via 'schema suggestions') leaking internal structural details rather than credentials or sensitive records. No EPSS score, no CISA KEV listing, and no public POC were provided in the input, so there is no evidence of exploitation probability or active abuse: no public exploit identified at time of analysis. The main value of this disclosure is as reconnaissance aiding a follow-on attack, not as a standalone compromise. Missing data to note: EPSS probability is absent, so widespread-exploitation likelihood cannot be quantified; the description does not specify which schema details are exposed or whether any authentication context applies, and the CVSS PR:N (unauthenticated) should be verified against the vendor advisory since information-disclosure bugs in enterprise management tooling are sometimes reachable only post-authentication.

A remote attacker without credentials sends requests to an exposed IBM Concert instance and retrieves schema suggestion data, revealing internal data model or structural details. The attacker uses this leaked information to map the application and plan a more targeted follow-on attack. No public proof-of-concept exploit was identified in the provided data.