EUVD-2025-204635

Comprehensive Technical Analysis of EUVD-2025-204635

1. Vulnerability Assessment and Severity Evaluation

The vulnerability in the Flex Store Users plugin for WordPress, identified as EUVD-2025-204635 (CVE-2025-13619), is a critical privilege escalation issue. The Base Score of 9.8, as per CVSS 3.1, indicates a highly severe vulnerability. The scoring vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:

• 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 to exploit.
• Privileges Required (PR): None (N) - No prior authentication is 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 has a high impact on the confidentiality of the system.
• Integrity (I): High (H) - The vulnerability has a high impact on the integrity of the system.
• Availability (A): High (H) - The vulnerability has a high impact on the availability of the system.

Given these factors, the vulnerability is considered critical and poses a significant risk to any WordPress site using the affected plugin.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves exploiting the fsUserHandle::signup and fsSellerRole::add_role_seller functions, which do not properly restrict user roles during registration. An unauthenticated attacker can exploit this by:

1. Supplying the 'administrator' Role: During the registration process, the attacker can supply the 'administrator' role, thereby gaining administrative access to the site.
2. Using the 'fs_type' Parameter: If the Flex Store Seller plugin is also activated, the attacker can exploit the vulnerability using the 'fs_type' parameter.

The attack can be executed remotely without any user interaction, making it highly exploitable.

3. Affected Systems and Software Versions

The vulnerability affects all versions of the Flex Store Users plugin up to and including version 1.1.0. Any WordPress site using this plugin within the specified version range is at risk. Additionally, the presence of the Flex Store Seller plugin can exacerbate the vulnerability.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following steps are recommended:

1. Update the Plugin: Immediately update the Flex Store Users plugin to a version higher than 1.1.0, if available.
2. Disable Registration: Temporarily disable user registration until the plugin is updated.
3. Monitor for Suspicious Activity: Implement monitoring to detect any suspicious registration activities or unauthorized administrative access.
4. Implement Role Restrictions: Ensure that user roles are properly restricted during the registration process.
5. Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations and individuals using WordPress with the affected plugin. The potential for unauthenticated attackers to gain administrative access can lead to data breaches, unauthorized modifications, and service disruptions. This underscores the importance of timely updates and regular security assessments for all web applications.

6. Technical Details for Security Professionals

Vulnerable Functions:

• fsUserHandle::signup
• fsSellerRole::add_role_seller

Exploitation Details:

• The vulnerability allows an attacker to register with the 'administrator' role by manipulating the registration parameters.
• The 'fs_type' parameter can be used to exploit the vulnerability if the Flex Store Seller plugin is activated.

Detection and Response:

• Log Analysis: Review registration logs for any unusual role assignments.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on suspicious registration activities.
• Patch Management: Ensure that all plugins and themes are regularly updated to the latest versions.

References:

• Wordfence Threat Intelligence
• ThemeForest Product Page
• NVD CVE-2025-13619

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their WordPress sites from potential attacks.