EUVD-2025-198490

Comprehensive Technical Analysis of EUVD-2025-198490

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-198490 affects the Mstoreapp Mobile App WordPress plugin (versions up to 2.08) and the Mstoreapp Mobile Multivendor plugin (versions up to 9.0.1). The issue arises from improper user identity verification during AJAX actions, allowing unauthenticated users to retrieve valid sessions for arbitrary users by knowing their email addresses.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS:3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability due to the high impact on confidentiality, integrity, and availability. The attack vector is network-based (AV:N), requires low complexity (AC:L), no privileges (PR:N), and no user interaction (UI:N). The scope is unchanged (S:U), but the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: An attacker can exploit this vulnerability without needing any authentication.
• Email Address Knowledge: The attacker only needs to know the email address of the target user.

Exploitation Methods:

• Session Hijacking: By knowing the email address of a user, an attacker can retrieve a valid session for that user, effectively hijacking the session.
• Data Exfiltration: Once the session is hijacked, the attacker can access sensitive information associated with the user's account.
• Unauthorized Actions: The attacker can perform actions on behalf of the user, such as modifying account details or making unauthorized purchases.

3. Affected Systems and Software Versions

Affected Software:

• Mstoreapp Mobile App WordPress Plugin: Versions up to 2.08
• Mstoreapp Mobile Multivendor Plugin: Versions up to 9.0.1

Affected Systems:

• Any WordPress installation using the affected versions of the Mstoreapp Mobile App or Mstoreapp Mobile Multivendor plugins.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Plugins: Ensure that all instances of the Mstoreapp Mobile App and Mstoreapp Mobile Multivendor plugins are updated to versions beyond 2.08 and 9.0.1, respectively.
• Disable AJAX Actions: Temporarily disable or restrict AJAX actions that do not properly verify user identity until a patch is applied.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits of all plugins and third-party components.
• User Education: Educate users about the importance of keeping their email addresses private and recognizing potential phishing attempts.
• Monitoring: Implement monitoring tools to detect and respond to unusual session activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected plugins. The potential for unauthorized access and data exfiltration can lead to financial losses, reputational damage, and legal consequences under GDPR.

Regulatory Compliance:

• Organizations must ensure compliance with GDPR by promptly addressing the vulnerability and notifying affected users if a breach occurs.
• Failure to mitigate this vulnerability could result in regulatory penalties and legal actions.

6. Technical Details for Security Professionals

Technical Overview:

• Vulnerability Type: Improper user identity verification during AJAX actions.
• Exploit Mechanism: Unauthenticated users can send crafted AJAX requests to retrieve valid sessions for arbitrary users by knowing their email addresses.
• Detection: Monitor for unusual session activities and AJAX requests that do not follow standard authentication procedures.

Mitigation Steps:

1. Update Plugins: Ensure all instances of the affected plugins are updated to the latest versions.
2. Implement Additional Verification: Add additional layers of user verification for AJAX actions.
3. Logging and Monitoring: Enhance logging and monitoring to detect and respond to suspicious activities.
4. User Notification: Notify users of the potential risk and advise them to keep their email addresses private.

References:

• WPScan Vulnerability Report
• NVD CVE-2025-11127

By addressing this vulnerability promptly and comprehensively, organizations can mitigate the risk of unauthorized access and data breaches, thereby protecting their users and maintaining compliance with regulatory requirements.