CVE-2026-25768 identifies a missing authorization vulnerability (CWE-862) in LavinMQ, a message queue and streaming server product by CloudAMQP. The issue affects all versions prior to 2.6.6, where authenticated users can access metadata within the broker that they are not authorized to view. This metadata could include configuration details, routing information, or other sensitive operational data that could aid an attacker in further reconnaissance or lateral movement within the messaging infrastructure. The vulnerability arises because the server fails to enforce proper authorization checks on metadata access requests, allowing privilege escalation within the authenticated user context. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N) indicates the attack can be performed remotely over the network with low attack complexity, requires low privileges (authenticated user), and does not require user interaction. The impact is primarily on confidentiality, as unauthorized metadata disclosure could reveal sensitive system details. No integrity or availability impacts are noted. The vulnerability was published on February 12, 2026, and fixed in LavinMQ version 2.6.6. No public exploits have been reported, but the high severity score suggests that exploitation could have significant consequences in environments relying on LavinMQ for messaging and streaming services.

For European organizations, this vulnerability poses a significant risk to the confidentiality of messaging infrastructure metadata. Unauthorized access to broker metadata can facilitate further attacks, such as privilege escalation, targeted attacks on messaging flows, or exposure of sensitive operational details. Industries such as finance, telecommunications, and critical infrastructure that rely heavily on message queuing for real-time data processing could face increased risk of data leakage or operational disruption. The exposure of metadata might also contravene data protection regulations like GDPR if it leads to unauthorized access to personal or sensitive data indirectly. Additionally, organizations using LavinMQ in multi-tenant or cloud environments could see cross-tenant data exposure risks. The lack of known exploits reduces immediate risk but does not eliminate the threat, as attackers could develop exploits given the public disclosure. The vulnerability's ease of exploitation and high confidentiality impact necessitate urgent remediation to prevent potential breaches.

European organizations should immediately upgrade LavinMQ installations to version 2.6.6 or later, where the missing authorization checks have been fixed. Until patching is complete, implement strict network segmentation and access controls to limit authenticated user access to only necessary resources. Employ robust authentication mechanisms to reduce the risk of unauthorized user access. Monitor broker logs and metadata access patterns for anomalies that could indicate exploitation attempts. Conduct regular audits of user permissions within LavinMQ to ensure the principle of least privilege is enforced. If possible, deploy intrusion detection systems tailored to detect unusual messaging broker activity. Additionally, consider encrypting sensitive metadata at rest and in transit to reduce exposure risks. Engage with CloudAMQP support for any vendor-specific hardening guidelines or updates. Finally, incorporate this vulnerability into incident response plans to quickly address any detected exploitation.