EUVD-2025-11745

Comprehensive Technical Analysis of EUVD-2025-11745

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-11745 pertains to a Deserialization of Untrusted Data issue in Mahmudul Hasan Arif FluentBoards, which allows for Object Injection. This vulnerability is particularly severe due to its potential to compromise the confidentiality, integrity, and availability of the affected systems. The CVSS (Common Vulnerability Scoring System) Base Score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability can result in a complete loss of confidentiality.
• Integrity (I): High (H) - The vulnerability can result in a complete loss of integrity.
• Availability (A): High (H) - The vulnerability can result in a complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is the deserialization of untrusted data, which can lead to Object Injection. Attackers can exploit this by:

• Crafting Malicious Input: An attacker can send specially crafted serialized data to the application.
• Object Injection: Upon deserialization, the malicious data can inject objects into the application, leading to arbitrary code execution or other malicious activities.
• Remote Code Execution (RCE): If the injected objects can manipulate the application's control flow, the attacker can execute arbitrary code on the server.

3. Affected Systems and Software Versions

The vulnerability affects all versions of FluentBoards from its inception (n/a) through version 1.47. Users of these versions are at risk and should take immediate action to mitigate the vulnerability.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps are recommended:

• Update Software: Immediately update to a patched version of FluentBoards if available.
• Input Validation: Implement strict input validation and sanitization to ensure that only trusted data is deserialized.
• Use Secure Deserialization Libraries: Utilize libraries that provide secure deserialization mechanisms.
• Monitoring and Logging: Enhance monitoring and logging to detect and respond to any suspicious activities related to deserialization.
• Network Segmentation: Implement network segmentation to limit the spread of potential attacks.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of WordPress plugins like FluentBoards. Organizations and individuals using this plugin are at risk of data breaches, unauthorized access, and potential service disruptions. The high severity score underscores the need for immediate attention and remediation to prevent widespread exploitation.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Vulnerability Type: Deserialization of Untrusted Data leading to Object Injection.
• Affected Component: FluentBoards plugin for WordPress.
• Exploitation: The vulnerability can be exploited by sending malicious serialized data to the application, leading to Object Injection and potential RCE.
• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for suspicious deserialization activities.
• Response: Develop and test incident response plans to quickly address any detected exploitation attempts.
• Patch Management: Ensure that all WordPress plugins, including FluentBoards, are regularly updated and patched.

Conclusion

The vulnerability described in EUVD-2025-11745 is critical and requires immediate attention from cybersecurity professionals. By understanding the attack vectors, affected systems, and recommended mitigation strategies, organizations can effectively protect themselves from potential exploitation. The European cybersecurity landscape must remain vigilant and proactive in addressing such high-severity vulnerabilities to maintain the integrity and security of digital infrastructure.

References

• Patchstack Vulnerability Database
• CVE ID: CVE-2025-39551
• Assigner: Patchstack
• ENISA ID Product: 7d2c917f-1d69-3222-88af-cbebeb9468e9
• ENISA ID Vendor: 59b7b070-274d-3b94-94e1-28c77d6512ec