CVE-2025-7669 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Avishi WP PayPal Payment Button plugin for WordPress, specifically all versions up to and including 2.0. The vulnerability arises due to missing or incorrect nonce validation on the 'avishi-wp-paypal-payment-button/index.php' page. Nonces in WordPress are security tokens used to verify that a request comes from a legitimate source and to prevent unauthorized actions. Because this validation is absent or improperly implemented, an attacker can craft a malicious request that, if executed by an authenticated site administrator (e.g., by clicking a link or visiting a malicious page), allows the attacker to update plugin settings and inject malicious web scripts. This injection could lead to further compromise such as persistent cross-site scripting (XSS), unauthorized configuration changes, or other malicious activities. The vulnerability does not require the attacker to be authenticated, but it does require user interaction from an administrator, making it a UI-required attack vector. The CVSS v3.1 base score is 6.1 (medium severity), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and limited impact on confidentiality and integrity, with no impact on availability. No known exploits are currently reported in the wild. The vulnerability affects the confidentiality and integrity of the affected WordPress sites by enabling unauthorized changes and potential script injection, which could be leveraged for further attacks such as session hijacking or data theft.

For European organizations using WordPress sites with the Avishi WP PayPal Payment Button plugin, this vulnerability poses a moderate risk. Exploitation could lead to unauthorized modification of payment button settings, potentially redirecting payments or injecting malicious scripts that compromise site visitors or administrators. This can damage organizational reputation, lead to financial fraud, or result in data breaches involving customer information. E-commerce sites or organizations relying on PayPal payment integration are particularly at risk. Since the attack requires tricking an administrator into performing an action, organizations with less stringent administrative security awareness or lacking multi-factor authentication are more vulnerable. Additionally, compromised payment plugins can disrupt business operations and customer trust. Given the widespread use of WordPress in Europe, especially among small and medium enterprises, the impact could be significant if not mitigated promptly.

1. Immediate update or patching: Although no official patch links are provided, organizations should monitor the vendor's site or trusted security advisories for updates addressing nonce validation. 2. Implement Web Application Firewall (WAF) rules to detect and block suspicious POST requests targeting the vulnerable plugin endpoint. 3. Enforce strict administrative access controls, including multi-factor authentication (MFA) for WordPress admin accounts to reduce the risk of successful social engineering. 4. Conduct administrator security awareness training to recognize phishing attempts and suspicious links that could trigger CSRF attacks. 5. Regularly audit and monitor plugin configurations and logs for unauthorized changes or anomalies. 6. Consider temporarily disabling or removing the Avishi WP PayPal Payment Button plugin if immediate patching is not possible, especially on high-risk or critical sites. 7. Employ Content Security Policy (CSP) headers to limit the impact of injected scripts. 8. Use security plugins that provide nonce validation enforcement or additional CSRF protections.