EUVD-2025-19376

Comprehensive Technical Analysis of EUVD-2025-19376

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-19376 pertains to an Authentication Bypass issue in the Simple Payment plugin for WordPress. This vulnerability allows unauthenticated attackers to log in as administrative users due to improper verification of user identity in the create_user() function. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, which is considered critical.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability can be exploited remotely over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• PR:N (No Privileges Required): No prior authentication is needed to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:U (Unchanged): The scope of the vulnerability does not change.
• C:H (High Confidentiality Impact): The vulnerability can lead to unauthorized access to sensitive information.
• I:H (High Integrity Impact): The vulnerability can lead to unauthorized modification of system files or information.
• A:H (High Availability Impact): The vulnerability can lead to disruption of services or system availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: Attackers can exploit the vulnerability without needing any credentials.
• Remote Exploitation: The attack can be carried out over the internet, making it a significant threat to any WordPress site using the affected plugin.

Exploitation Methods:

• Direct Login: Attackers can directly log in as administrative users by exploiting the create_user() function.
• Automated Scripts: Attackers can use automated scripts to scan for vulnerable WordPress sites and exploit the vulnerability en masse.

3. Affected Systems and Software Versions

Affected Software:

• Simple Payment plugin for WordPress

Affected Versions:

• Versions 1.3.6 to 2.3.8

Vendor:

• idokd

4. Recommended Mitigation Strategies

Immediate Actions:

• Update the Plugin: Upgrade to the latest version of the Simple Payment plugin (version 2.3.9 or later) which includes the security fix.
• Disable the Plugin: If an update is not immediately possible, disable the plugin to prevent exploitation.

Long-Term Strategies:

• Regular Updates: Ensure all plugins and WordPress core are regularly updated.
• Security Audits: Conduct regular security audits and vulnerability assessments.
• Monitoring: Implement monitoring and logging to detect any suspicious activities.
• Access Controls: Enforce strict access controls and use multi-factor authentication (MFA) for administrative accounts.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using WordPress with the Simple Payment plugin. The potential for unauthenticated administrative access can lead to data breaches, financial losses, and reputational damage. Given the widespread use of WordPress, this vulnerability could affect a large number of websites across Europe, making it a critical concern for cybersecurity professionals and organizations.

6. Technical Details for Security Professionals

Vulnerability Details:

• The create_user() function in the Simple Payment plugin does not properly verify the user's identity, allowing unauthenticated attackers to log in as administrative users.
• The vulnerability exists in the authentication logic, which fails to validate user credentials adequately.

Detection Methods:

• Code Review: Conduct a thorough code review of the create_user() function and related authentication mechanisms.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for unusual login attempts or administrative actions.
• Log Analysis: Regularly analyze logs for any unauthorized access attempts or suspicious activities.

Patch Analysis:

• The patch in version 2.3.9 addresses the authentication bypass by implementing proper user verification mechanisms in the create_user() function.

References:

• Wordfence Threat Intelligence
• WordPress Plugin Changeset

Conclusion: This vulnerability underscores the importance of regular updates and thorough security practices in maintaining the integrity of web applications. Cybersecurity professionals should prioritize addressing this issue to protect against potential exploitation and ensure the security of their WordPress environments.