CVE-2026-73898 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 require human interaction from a person other than the attacker and while the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). 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 6.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 4.5.0. This security flaw represents a significant risk to organizations relying on this framework for building microservices and cloud-native applications in Java environments. The core technical issue stems from an improper validation or handling mechanism within the HTTP request processing pipeline that allows unauthenticated actors to manipulate server-side data structures. While the vulnerability is technically located in Helidon, its exploitation can lead to a scope change where additional products integrated with or dependent on this middleware are also compromised, thereby amplifying the blast radius of any successful attack beyond the immediate application boundary.
From an operational perspective, the exploitability profile of this vulnerability presents a unique challenge due to the requirement for human interaction. Although the attacker has network access and does not need prior authentication credentials, they must induce another user to perform a specific action that triggers the malicious payload or state change. This characteristic aligns with social engineering vectors where an attacker might craft deceptive links or requests that appear legitimate to end-users. Once triggered by this human element, the vulnerability allows for unauthorized modifications to accessible data within Helidon. Specifically, attackers can execute update, insert, and delete operations on database records or internal storage managed by the application layer. This capability directly undermines the integrity of the system, allowing malicious actors to alter business logic outcomes, corrupt datasets, or remove critical information without authorization.
In addition to integrity violations, this vulnerability also facilitates unauthorized read access to a subset of data accessible by Helidon. While the confidentiality impact is rated as low in terms of total data exposure, it still permits attackers to extract sensitive information that may be exposed through specific API endpoints or internal state queries triggered by the exploit. The combination of these capabilities means that an attacker can not only steal limited confidential data but also actively corrupt and destroy existing records. This dual threat vector significantly impacts the trustworthiness of the application's backend services, potentially leading to financial loss, regulatory non-compliance, and reputational damage for the affected organization.
The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 6.1, indicating a medium level of risk. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) highlights that the attack vector is network-based with low complexity and no required privileges for the attacker, but it relies on user interaction. The scope change indicates that the vulnerability affects resources beyond the vulnerable component itself. In terms of industry standards classification, this behavior maps closely to CWE-798: Use of Hard-coded Credentials if authentication bypasses are involved in the trigger mechanism, or more accurately to CWE-20: Improper Input Validation regarding how requests are processed before data manipulation occurs. Furthermore, from a tactical perspective within the MITRE ATT&CK framework, this vulnerability supports techniques associated with Initial Access via Spearphishing Link (T1566.002) if social engineering is used to trigger it, followed by Data Manipulation under Persistence or Impact categories depending on whether the changes are meant to maintain access or cause damage.
To mitigate this risk, organizations running Helidon 4.5.0 should prioritize applying the latest security patches provided by Oracle as soon as they become available. Until patching is feasible, implementing strict input validation and sanitization routines at the application layer can help reduce the attack surface. Additionally, deploying Web Application Firewalls (WAFs) with rules designed to detect anomalous HTTP request patterns may provide a layer of defense against exploitation attempts that rely on specific malformed inputs or unusual parameter combinations. Security teams should also enforce strict authentication policies and implement multi-factor authentication for administrative interfaces to minimize the likelihood of successful human interaction triggers, although this vulnerability specifically targets unauthenticated paths which require careful review of public-facing endpoints. Regular security assessments and penetration testing focused on HTTP request manipulation can further help identify similar implementation flaws before they are exploited in production environments.