CVE-2026-71165 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 3.2.18. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 5.4 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).
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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 3.2.18. This security flaw represents a significant risk to organizations relying on this framework for building reactive microservices and web applications in Java environments. The core issue stems from insufficient input validation or access control mechanisms inherent in how the server processes incoming HTTP requests. While Helidon is designed as a high-performance, secure framework, this specific iteration contains a logic error that allows an attacker with low privileges to manipulate data integrity and confidentiality through standard network protocols.
The technical nature of this flaw aligns closely with CWE-601, which describes URL Redirection to Untrusted Site or in the context of server-side request handling, it may relate to CWE-918 Server-Side Request Forgery (SSRF) if internal resources are accessed improperly, or more likely CWE-20 Improper Input Validation leading to unauthorized data manipulation. The vulnerability is characterized by its ease of exploitation and low barrier to entry for attackers. It does not require user interaction or complex social engineering tactics. Instead, it can be triggered remotely via HTTP requests, allowing a network-based attacker to interact directly with the vulnerable service endpoints.
The operational impact of this vulnerability is substantial due to the combination of accessibility and privilege level required. An attacker needs only low-privileged access within the network perimeter to initiate an attack vector. This means that even compromised user accounts or devices on the internal network can serve as launchpads for exploitation. The successful execution of attacks against this flaw results in both unauthorized read and write operations against Helidon accessible data. Specifically, attackers gain the ability to perform unauthorized updates, inserts, or deletes, which compromises the integrity of stored information. Additionally, they achieve unauthorized read access to a subset of sensitive data, thereby violating confidentiality requirements.
From an offensive security perspective, this vulnerability maps directly to MITRE ATT&CK techniques related to Data Exfiltration and Data Manipulation. The ability to modify database records or application state without authorization falls under the Tactic Impact, specifically Techniques such as Data Destruction (T1485) for delete operations or Data Encrypted for Impact if encryption is bypassed, though here it is more aligned with direct data modification like SQL Injection patterns often seen in web frameworks. The network-based nature of the attack places it within the Initial Access and Persistence tactics depending on how long the compromised state remains active.
The CVSS 3.1 base score of 5.4 reflects a medium severity rating, driven by the Local Network Attack Vector (AV:N), Low Complexity (AC:L), and Low Privileges Required (PR:L). The absence of User Interaction (UI:N) further lowers the difficulty for attackers. While Availability is not directly impacted according to the vector string A:N, the integrity and confidentiality impacts are rated as Low but significant enough to cause data corruption or leakage in sensitive business contexts. This scoring indicates that while it may not immediately crash systems, it poses a serious threat to data governance and compliance standards such as GDPR or HIPAA if personal or regulated data is involved.
Mitigation strategies must focus on immediate patching and network segmentation. The primary remediation step is to upgrade the Helidon framework to a version where this specific flaw in the Imperative Web Server has been resolved by Oracle Fusion Middleware engineering teams. Until patches are applied, organizations should implement strict input validation at the application layer to sanitize all HTTP inputs. Additionally, deploying Web Application Firewalls (WAFs) with rules tailored to detect anomalous request patterns associated with data manipulation can provide a temporary defensive layer. Network access controls should be tightened to ensure that only authorized services and users can communicate with Helidon endpoints over HTTP, reducing the attack surface available to low-privileged attackers on the network.