CVE-2026-7042: Medium Vulnerability in 666ghj MiroFish

A flaw has been found in 666ghj MiroFish up to version 0.1.2. This affects the function create_app of the file backend/app/__init__.py of the component REST API Endpoint. Executing a manipulation can lead to missing authentication. It is possible to launch the attack remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

The CVSS score for this vulnerability is 6.9, classifying it as medium severity. This implies that while the exploit may not be trivial, it could still present a significant risk, especially in environments where MiroFish is deployed. Risk to organizations includes unauthorized access to critical functions, potentially compromising sensitive data or application integrity.

Given the nature of the vulnerability, organizations should prioritize patching immediately. As this flaw allows remote exploitation, the urgency for remediation is critical to prevent any potential misuse.

Currently, there is no public exploit confirmed, and the vulnerability has not been included in the Known Exploited Vulnerabilities (KEV) catalog. However, the existence of a proof of concept indicates that it may be actively exploited in the wild.

Organizations using the affected version should take immediate action to assess their exposure and apply necessary updates or mitigations.

Vulnerability Details

The vulnerability allows for missing authentication within the REST API Endpoint of MiroFish, particularly through its create_app function. This flaw could lead to unauthorized access to functionalities that are supposed to be protected. The CWE classifications associated with this vulnerability include CWE-287 (Improper Authentication) and CWE-306 (Missing Authentication for Critical Functions).

The CVSS 3.1 score is 7.3, indicating a high severity level, while the CVSS 4.0 score is 6.9, classifying it as medium severity. This reflects the potential impact an attacker could have if they successfully exploit this vulnerability.

The vulnerability was published on April 26, 2026, and has yet to receive a response from the development team regarding a patch or remediation.

Technical Analysis

The root cause of this vulnerability lies in the design of the MiroFish application that allows remote exploitation due to missing authentication checks. Attackers may leverage this flaw to interact with the application as if they were authenticated users, potentially leading to unauthorized actions.

This vulnerability can be exploited over the network, with low attack complexity, meaning that an attacker does not require extensive knowledge or sophisticated techniques to exploit it. No privileges are required, and user interaction is not necessary for exploitation.

The impacts on confidentiality, integrity, and availability are all classified as low, but the potential for unauthorized access remains a significant concern, as it could lead to further exploits or data breaches.

Risk & Impact Analysis

Real-world deployment of MiroFish with this vulnerability presents a risk to organizations, particularly those that rely heavily on its REST API for critical functionalities. The missing authentication could enable attackers to bypass security measures, leading to unauthorized access and potential manipulation of application data.

The urgency assessment is high given the CVSS score of 7.3, indicating that organizations should address this vulnerability in their priority patch cycle. The blast radius potential is considerable, particularly for organizations hosting sensitive operations or data.

Therefore, organizations should be proactive in evaluating their exposure and implementing remediation measures as quickly as possible.

Exploitation Status

Affected Versions

All versions of 666ghj MiroFish prior to version 0.1.2 are affected by this vulnerability. Organizations are advised to upgrade to the latest version as soon as it becomes available.

Mitigation & Remediation

Organizations should monitor the official repository for updates and apply patches as soon as they are released. If an immediate patch is unavailable, consider implementing network controls to restrict access to the affected endpoints. For further guidance on vulnerability management, organizations may refer to vulnerability management program design to better manage and mitigate risks associated with vulnerabilities.

Detection Guidance

To detect potential exploitation of this vulnerability, organizations should look for unusual authentication patterns or unauthorized access attempts in logs. Monitoring for behavioral anomalies and implementing network signatures can also assist in identifying suspicious activities related to the REST API endpoints.

AppSecure Threat Intelligence Insight

This vulnerability highlights the importance of rigorous authentication mechanisms in software development. As applications increasingly rely on REST APIs, ensuring robust security measures is crucial. Security teams should also consider reviewing their application security posture and look for similar vulnerabilities across their software stack. For more insights on securing your applications, refer to the following resources: web application penetration testing, API penetration testing guide, and security testing best practices to prevent similar exploits in the future.