CVE-2026-101568 in Helidon
Summary
by MITRE • 10/21/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-health). Supported versions that are affected are 3.0.0-3.2.21, 4.0.0-4.5.5 and 27.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the helidon-health component of Oracle Fusion Middleware, specifically affecting Helidon versions ranging from 3.0.0 through 3.2.21, as well as version ranges 4.0.0 to 4.5.5 and release 27.0.0. This security flaw is classified under the category of improper access control, which corresponds to CWE-284 in standard vulnerability classification taxonomies. The core technical issue stems from an insufficient validation or authorization check within the health monitoring endpoints exposed by the Helidon framework. These endpoints are designed for operational diagnostics and status reporting but fail to enforce strict authentication requirements before serving sensitive internal data structures. Consequently, any entity capable of reaching these network interfaces can interact with them without providing valid credentials, creating a direct path for information disclosure.
The attack vector is characterized as remote and non-interactive, allowing an unauthenticated attacker to exploit the flaw via standard HTTP protocols. This aligns with the ATT&CK technique T1078, which covers Valid Accounts or default configurations that can be abused when security controls are misconfigured or absent. The low complexity of exploitation means that automated tools can easily probe for this weakness across large networks without requiring user interaction or complex payload construction. Once triggered, the vulnerability results in unauthorized read access to a subset of data accessible by Helidon itself. This typically includes internal metrics, configuration details, health status indicators, and potentially other runtime state information that is not intended for public consumption but is inadvertently exposed due to the missing authentication gatekeeper.
The operational impact of this vulnerability centers on confidentiality loss rather than integrity or availability disruptions. With a CVSS 3.1 base score of 5.3, the severity is rated as medium, primarily driven by the unrestricted access to sensitive internal data. While an attacker cannot directly execute code or modify system files through this specific flaw, the exposure of internal health and configuration data can facilitate further attacks. For instance, disclosed endpoint URLs, version numbers, or internal service dependencies can be used for targeted reconnaissance in subsequent phases of a cyber attack lifecycle. This information aids adversaries in mapping the network topology and identifying other potential entry points with higher privileges, thereby increasing the overall risk posture of the affected environment.
Mitigation strategies must focus on immediate remediation through software updates and temporary architectural controls. The primary recommendation is to upgrade Helidon to versions that have patched this authorization bypass, ensuring that all supported releases are brought up to date according to Oracle’s security advisory guidelines. In environments where patching cannot be implemented immediately due to operational constraints, network-level mitigations should be deployed. This includes restricting access to the health check endpoints via firewall rules or reverse proxy configurations so that only trusted management networks or authorized monitoring systems can reach these interfaces. Additionally, implementing mutual TLS authentication for internal service communication and ensuring that all diagnostic APIs require valid bearer tokens will effectively neutralize this unauthenticated access vector until a permanent code fix is applied.