CVE-2025-9628 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the integration of the AMO.CRM plugin for WordPress, specifically all versions up to and including 1.0.1. The root cause of this vulnerability lies in missing or incorrect nonce validation within the settings_page function of the plugin. Nonces in WordPress are security tokens used to verify that requests to perform sensitive actions originate from legitimate users and not from malicious third parties. Due to the absence or improper implementation of nonce checks, an unauthenticated attacker can craft a malicious request that, if executed by a logged-in site administrator (for example, by clicking a link), allows the attacker to modify critical API connection settings. These settings include the AMO.CRM API URL, login credentials, and the API hash key. Such modifications could lead to unauthorized data access, data manipulation, or redirection of CRM data to attacker-controlled endpoints. The vulnerability does not require authentication but does require user interaction (UI:R), specifically tricking an administrator into performing an action. The CVSS 3.1 base score is 4.3, reflecting a medium severity level, with the vector indicating network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality impact, limited integrity impact, and no availability impact. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability is classified under CWE-352, which is a common web security weakness related to CSRF attacks.

For European organizations using WordPress sites integrated with the AMO.CRM plugin, this vulnerability poses a moderate risk. If exploited, attackers could alter API connection settings, potentially redirecting sensitive customer relationship management data to unauthorized endpoints or disrupting CRM operations. This could lead to data integrity issues, loss of trust, and potential regulatory compliance violations under GDPR if personal data is mishandled or exposed. Since the attack requires tricking an administrator into clicking a malicious link, the risk is somewhat mitigated by user awareness but remains significant in environments where phishing or social engineering attacks are prevalent. The impact is primarily on data integrity rather than confidentiality or availability, but the manipulation of API credentials could be a stepping stone for further attacks or data exfiltration. European organizations with high reliance on AMO.CRM for customer data management and those with less mature security awareness training are particularly vulnerable.

To mitigate this vulnerability, organizations should immediately audit their WordPress installations for the presence of the AMO.CRM plugin and verify the version in use. Until an official patch is released, administrators should restrict access to the WordPress admin panel to trusted networks or VPNs to reduce exposure. Implementing Web Application Firewall (WAF) rules to detect and block CSRF attempts targeting the plugin’s settings page can provide additional protection. Administrators should be trained to recognize phishing attempts and avoid clicking on suspicious links. Monitoring and logging changes to plugin settings can help detect unauthorized modifications early. Once a patch is available, it should be applied promptly. Additionally, plugin developers should implement proper nonce validation on all sensitive actions and consider adding multi-factor authentication for administrative actions to reduce the risk of CSRF exploitation.