CVE-2026-0603 is a vulnerability identified in Red Hat AMQ Broker 7 version 5.2.8, specifically related to the Hibernate component's InlineIdsOrClauseBuilder functionality. The flaw arises from improper neutralization of special elements used in SQL commands, enabling a second-order SQL injection attack. In this context, a remote attacker with low privileges can supply specially crafted, unsanitized non-alphanumeric characters in the ID column. Because the InlineIdsOrClauseBuilder does not adequately sanitize these inputs before constructing SQL queries, the attacker can manipulate the SQL commands executed by the application. This manipulation can lead to unauthorized disclosure of sensitive information, such as reading system files via database functions, as well as unauthorized data manipulation or deletion within the application's database. The consequence of such exploitation includes potential application-level denial of service due to corrupted or deleted data. The vulnerability does not require user interaction and can be exploited remotely, increasing its risk profile. The CVSS v3.1 score of 8.3 reflects high impact on confidentiality and integrity, with a low attack complexity and only low privileges required. Although no known exploits are reported in the wild, the vulnerability's nature and impact necessitate urgent attention. The affected product, Red Hat AMQ Broker 7, is a widely used messaging broker in enterprise environments, often deployed in critical infrastructure and business applications, making this vulnerability particularly concerning for organizations relying on this middleware.

For European organizations, exploitation of CVE-2026-0603 could result in significant data breaches, including exposure of sensitive business or personal data, which may violate GDPR and other data protection regulations. The ability to manipulate or delete data could disrupt business operations, cause financial loss, and damage reputation. Application-level denial of service could impact availability of critical messaging services, affecting communication and integration between enterprise systems. Industries such as finance, telecommunications, manufacturing, and government services that rely on Red Hat AMQ Broker for messaging and integration are at heightened risk. The breach of confidentiality and integrity could also lead to regulatory penalties and loss of customer trust. Given the remote exploitability and low privilege requirement, attackers could leverage this vulnerability as an entry point for further lateral movement within networks. The lack of user interaction needed makes automated exploitation feasible, increasing the threat landscape for European enterprises.

Organizations should immediately upgrade Red Hat AMQ Broker 7 to a patched version once available from Red Hat. In the interim, apply strict input validation and sanitization on all inputs that interact with InlineIdsOrClauseBuilder, especially the ID column, to prevent injection of special characters. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious SQL injection patterns targeting this vulnerability. Conduct thorough code reviews and security testing focusing on SQL query construction and input handling in affected components. Implement database activity monitoring to detect anomalous queries indicative of exploitation attempts. Restrict database permissions to the minimum necessary to limit the impact of any successful injection. Maintain up-to-date intrusion detection systems (IDS) and endpoint protection to identify and respond to exploitation attempts quickly. Educate developers and administrators about this vulnerability to ensure awareness and prompt remediation. Finally, monitor threat intelligence feeds for any emerging exploit code or attack campaigns targeting this CVE.