CVE-2025-27003 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the fullworks Quick Paypal Payments plugin, affecting versions up to 5.7.46. CSRF vulnerabilities allow attackers to trick authenticated users into submitting unauthorized requests to a web application in which they are currently authenticated. In this case, the vulnerability resides in the Quick Paypal Payments plugin, which facilitates PayPal payment processing on websites. An attacker could craft a malicious web page or link that, when visited by an authenticated user, causes the user’s browser to perform unintended actions on the vulnerable site without their consent. The CVSS 3.1 base score is 4.3 (medium severity), with the vector indicating the attack can be performed remotely over the network (AV:N), requires low attack complexity (AC:L), no privileges (PR:N), but does require user interaction (UI:R). The impact is limited to integrity (I:L) with no confidentiality or availability impact. There are no known exploits in the wild currently, and no patches have been linked yet. The vulnerability is classified under CWE-352, which is a common web security weakness related to insufficient anti-CSRF protections. Given that the plugin handles payment transactions, exploitation could lead to unauthorized payment actions or manipulation of payment parameters, potentially causing financial discrepancies or fraudulent transactions. However, the lack of confidentiality and availability impact suggests that sensitive data leakage or service disruption is unlikely from this vulnerability alone.

For European organizations using the fullworks Quick Paypal Payments plugin, this vulnerability could lead to unauthorized payment actions initiated by attackers leveraging authenticated user sessions. This could result in financial losses, fraudulent transactions, or reputational damage if customers’ payment processes are manipulated. E-commerce sites and online businesses relying on this plugin for PayPal transactions are particularly at risk. While the vulnerability does not directly expose sensitive data or cause denial of service, the integrity compromise in payment processing can have significant operational and financial consequences. Additionally, regulatory frameworks such as GDPR emphasize secure processing of payment data, and exploitation of this vulnerability could lead to compliance issues if it results in unauthorized transactions or data mishandling. The requirement for user interaction means phishing or social engineering could be used to lure users into triggering the exploit, increasing the risk in environments with less user security awareness.

Organizations should immediately verify if they are using the fullworks Quick Paypal Payments plugin version 5.7.46 or earlier. Until an official patch is released, practical mitigations include implementing additional CSRF protections at the application or web server level, such as enforcing strict SameSite cookie attributes, validating the Origin and Referer headers on payment-related requests, and employing web application firewalls (WAFs) with rules to detect and block suspicious CSRF attempts. Educating users to avoid clicking on untrusted links while authenticated on payment sites can reduce the risk of exploitation. Monitoring payment transaction logs for unusual or unauthorized activities can help detect exploitation attempts early. Once a patch becomes available, organizations should prioritize prompt application of updates. Additionally, reviewing and hardening the plugin’s configuration to limit exposure and ensuring that multi-factor authentication is enabled for administrative access can further reduce risk.