CVE-2026-71167 in Helidon
Summary
by MITRE • 08/19/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized access to critical data or complete access to all Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 9.4 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the Imperative Web Server component of Oracle Fusion Middleware Helidon, specifically affecting version 4.5.0. This security flaw is characterized by its high severity and ease of exploitation, allowing an unauthenticated attacker to compromise the system through network access via HTTP. The absence of required authentication for this attack vector significantly lowers the barrier to entry for malicious actors, enabling remote code execution or data manipulation without prior credentials. Such a configuration represents a critical failure in security architecture, where sensitive server-side logic is exposed directly to external networks without adequate validation or authorization checks.
From a technical perspective, the vulnerability enables unauthorized creation, deletion, or modification of critical data and all Helidon accessible data. This indicates that the flaw likely involves improper input validation or access control mechanisms within the HTTP request processing pipeline. An attacker can manipulate incoming requests to execute arbitrary operations on the backend systems, leading to complete integrity compromise. Furthermore, the vulnerability grants unauthorized access to critical data, resulting in a total loss of confidentiality for stored information. The ability to modify and delete data suggests that the application logic fails to enforce proper role-based or attribute-based access controls when handling state-changing HTTP methods such as POST, PUT, DELETE, or PATCH.
The operational impact extends beyond data compromise to include availability concerns. Successful exploitation can cause a partial denial of service against Helidon services. This aspect aligns with CWE-400, which describes resources not being properly controlled regarding their lifetime or consumption limits. By triggering resource exhaustion conditions through crafted requests, an attacker can degrade the performance or stability of the web server, preventing legitimate users from accessing applications hosted on the platform. The combination of high confidentiality and integrity impacts alongside a low availability impact results in a CVSS 3.1 Base Score of 9.4, classified as Critical severity. This score reflects the potential for widespread data breach and system manipulation while acknowledging that full service disruption may require additional conditions or payload complexity compared to simple data theft.
In terms of industry standard mapping, this vulnerability exhibits characteristics consistent with CWE-287 Improper Authentication and CWE-918 Server-Side Request Forgery if the flaw involves leveraging server-side processing for external requests. It also aligns with MITRE ATT&CK technique T1059 Command and Scripting Interpreter if arbitrary code execution is possible, or T1486 Data Encrypted for Impact if the denial of service leads to ransomware-like behavior, though primarily it maps to T1078 Valid Accounts if authentication bypasses are involved in broader attack chains. The lack of input validation points toward CWE-20 Improper Input Validation as a root cause category.
Mitigation strategies must prioritize immediate patching and configuration hardening. Oracle should apply the latest security updates for Helidon version 4.5.0 or upgrade to a newer, patched release where these access control flaws have been resolved. In environments where immediate patching is not feasible, network-level controls such as Web Application Firewalls can be configured to inspect HTTP traffic for patterns indicative of this exploitation vector. Implementing strict input validation on all server-side endpoints and enforcing authentication requirements for sensitive operations are essential defensive measures. Additionally, deploying rate limiting and request size restrictions can help mitigate the partial denial of service aspect by preventing resource exhaustion attacks. Regular security audits and penetration testing focused on API endpoints will further ensure that similar vulnerabilities do not persist in production environments.