CVE-2026-27535 in Solace Extra Plugin
Summary
by MITRE • 08/13/2026
Subscriber Broken Access Control in Solace Extra <= 1.6.0 versions.
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability identified as broken access control in Solace Extra versions 1.6.0 and earlier represents a critical security flaw that undermines the fundamental principles of access control mechanisms within the messaging platform. This issue stems from inadequate authorization checks that allow unauthorized users to bypass normal access restrictions and gain privileges they should not possess, directly violating the core security principle of least privilege. The vulnerability affects the subscriber functionality of the Solace Extra component, which serves as a critical interface for message consumption and distribution within enterprise messaging architectures.
The technical implementation flaw manifests in how the system validates user credentials and permissions when establishing subscriptions to message queues or topics. Specifically, the authentication and authorization mechanisms fail to properly verify the identity and privileges of subscribers before granting access to protected messaging resources. This weakness enables attackers to exploit misconfigurations or weak authentication processes to assume the identities of legitimate users with elevated privileges, thereby gaining unauthorized access to sensitive message data and potentially disrupting critical business operations.
The operational impact of this vulnerability extends beyond simple data breaches to encompass potential system compromise and service disruption. Attackers who successfully exploit this access control weakness can intercept confidential messages, modify message flows, or even inject malicious payloads into the messaging infrastructure. This represents a significant threat to organizations relying on Solace Extra for mission-critical communications, as it could lead to data leakage, service availability issues, and potential compliance violations. The vulnerability is particularly concerning in environments where sensitive financial, healthcare, or government data flows through the messaging system.
From a security framework perspective, this vulnerability maps directly to CWE-285, which defines improper authorization conditions that allow unauthorized access to resources. The issue also aligns with ATT&CK technique T1078.004, which covers valid accounts used for unauthorized access, as attackers can leverage legitimate user credentials to bypass access controls. Organizations should implement immediate mitigations including updating to patched versions of Solace Extra, strengthening authentication mechanisms, implementing robust monitoring and logging of subscription activities, and conducting comprehensive access control reviews. Additionally, network segmentation and principle of least privilege enforcement should be reinforced to limit the potential impact of any successful exploitation attempts.