CVE-2026-31278 in BioStar 2
Summary
by MITRE • 09/14/2026
An issue in the /api/v2/setting/adserversetting endpoint of Suprema BioStar 2 before 2.9.12 and and BioStar X before 1.0.2 allows attackers to obtain Active Directory service account credentials in cleartext by supplying a crafted GET request.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified in the /api/v2/setting/adserversetting endpoint of Suprema BioStar 2 prior to version 2.9.12 and BioStar X prior to version 1.0.2 represents a critical failure in data handling practices within access control management systems. This flaw allows unauthenticated or low-privileged attackers to extract Active Directory service account credentials that are stored and transmitted in cleartext. The root cause lies in the improper implementation of sensitive configuration endpoints, where the system fails to mask or encrypt credential fields during API responses. When an attacker crafts a specific GET request targeting this endpoint, the server processes the query without validating sufficient authorization levels for such sensitive data retrieval, subsequently returning the raw username and password strings associated with the Active Directory integration service account. This behavior violates fundamental security principles regarding the protection of authentication material, exposing organizations to significant risk if their internal network is compromised or if an attacker gains access to the management interface through other means.
From a technical perspective, this issue aligns closely with CWE-256, which categorizes issues involving the storage and transmission of passwords in cleartext. The vulnerability specifically manifests as an insecure direct object reference combined with improper output handling for sensitive information. In typical secure architectures, configuration endpoints should either return masked values such as asterisks or require elevated privileges that are strictly enforced through robust authentication mechanisms before exposing any secret material. By returning the actual service account credentials in plaintext, the application creates a high-value target for adversaries seeking to pivot within an enterprise environment. The use of cleartext transmission not only exposes the data during transit if TLS is misconfigured but also leaves it vulnerable at rest on client devices or logs that may capture API responses. This flaw undermines the integrity of the authentication subsystem, as service accounts often possess broad permissions necessary for synchronizing user directories and managing access policies across multiple physical security endpoints.
The operational impact of this vulnerability extends far beyond simple credential theft. Active Directory service accounts are typically granted significant privileges to facilitate seamless integration between the physical access control system and the corporate identity management infrastructure. If an attacker obtains these credentials, they can potentially authenticate as the service account within the Active Directory environment. This could allow for unauthorized enumeration of domain users, modification of group policies, or even lateral movement across the network if the service account has excessive permissions beyond what is strictly necessary for its function. Furthermore, possession of these credentials enables an attacker to manipulate access control configurations by impersonating the system itself. They could potentially disable security alerts, unlock restricted areas, or create backdoor accounts within the physical security platform, thereby compromising both digital and physical safety protocols. The ability to modify settings via this endpoint without proper validation exacerbates the risk, as it allows for persistent changes that may evade standard monitoring tools designed to detect user-level anomalies rather than service account abuse.
Mitigation strategies must focus on immediate remediation through software updates alongside architectural improvements in data handling. Organizations running affected versions of BioStar 2 or BioStar X should immediately apply the latest patches provided by Suprema, specifically version 2.9.12 for BioStar 2 and version 1.0.2 for BioStar X, which address this insecure credential exposure. In addition to patching, it is crucial to enforce strict access controls on all API endpoints, ensuring that only authorized administrators with verified multi-factor authentication can request sensitive configuration data. Developers should implement defensive coding practices such as masking response fields containing secrets and adhering to the principle of least privilege for service accounts used in integrations. Regular security audits and penetration testing focused on API security are recommended to identify similar flaws before they can be exploited. Monitoring tools should also be configured to detect unusual patterns of access to configuration endpoints, particularly those involving GET requests that return large blocks of sensitive data. By combining timely patching with robust identity governance and continuous monitoring, organizations can significantly reduce the attack surface associated with this vulnerability and maintain the integrity of their physical security infrastructure.