CVE-2026-0603 is a second-order SQL injection vulnerability identified in Red Hat AMQ Broker 7, specifically affecting version 5.2.8. The flaw arises from improper neutralization of special elements in SQL commands, particularly when the InlineIdsOrClauseBuilder component processes the ID column. An attacker with low privileges can supply specially crafted, unsanitized non-alphanumeric characters that are not properly sanitized before being incorporated into SQL queries. This second-order injection means the malicious input may be stored or processed in a way that triggers the injection at a later stage. Exploitation can lead to unauthorized disclosure of sensitive information, such as reading system files, as well as unauthorized modification or deletion of database records. The vulnerability can also cause application-level denial of service by corrupting or disrupting database operations. The CVSS v3.1 base score is 8.3, reflecting a high severity due to network attack vector, low attack complexity, required privileges, and no user interaction. The vulnerability affects a widely used middleware product that integrates messaging and data services, making it a critical concern for enterprise environments relying on Red Hat AMQ Broker for messaging infrastructure.

The impact of CVE-2026-0603 is significant for organizations using Red Hat AMQ Broker 7 version 5.2.8. Successful exploitation can lead to unauthorized access to sensitive data, including potentially reading system files, which compromises confidentiality. Attackers can also manipulate or delete data, impacting data integrity and potentially disrupting business operations. The ability to cause application-level denial of service can affect availability, leading to downtime and loss of service continuity. Given the middleware role of AMQ Broker in enterprise messaging and integration, exploitation could cascade into broader system disruptions. Organizations handling sensitive or regulated data are at heightened risk of compliance violations and reputational damage. The requirement for only low privileges to exploit increases the threat surface, as attackers with limited access can escalate their impact. Although no known exploits are currently in the wild, the vulnerability’s characteristics make it a likely target for attackers once exploit code becomes available.

To mitigate CVE-2026-0603, 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, especially those involving the ID column processed by InlineIdsOrClauseBuilder, to reject or properly encode non-alphanumeric characters. Employ parameterized queries or prepared statements to prevent SQL injection. Review and harden database permissions to minimize the impact of potential exploitation. Monitor application logs and database activity for unusual queries or access patterns indicative of injection attempts. Implement network segmentation and access controls to restrict exposure of the AMQ Broker service to trusted users and systems only. Conduct thorough code reviews and security testing focusing on SQL injection vectors within the application’s use of AMQ Broker. Finally, maintain an incident response plan to quickly address any exploitation attempts.