CVE-2025-6781 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the WordPress plugin 'Copymatic – AI Content Writer & Generator' developed by ryanfaber. This vulnerability exists in all versions up to and including 2.1 due to missing or incorrect nonce validation on the 'copymatic-menu' administrative page. Nonces in WordPress are security tokens used to verify that requests to perform sensitive actions originate from legitimate users and not from malicious third-party sites. The absence or improper implementation of nonce validation allows an attacker to craft a malicious request that, when executed by an authenticated administrator (e.g., by clicking a link or visiting a malicious page), can update the 'copymatic_apikey' option in the WordPress database. This API key is likely critical for the plugin’s operation, potentially controlling access to AI content generation services. Although the vulnerability does not allow direct code execution or data exfiltration, it compromises the integrity of the plugin’s configuration by enabling unauthorized modification of the API key. The CVSS v3.1 base score is 4.3 (medium severity), reflecting that the attack requires user interaction (an administrator must be tricked) but no authentication or elevated privileges are needed by the attacker themselves. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. The vulnerability is categorized under CWE-352, which is a common web application security weakness related to CSRF attacks.

For European organizations using WordPress sites with the Copymatic plugin installed, this vulnerability poses a risk primarily to the integrity of the plugin’s configuration. An attacker who successfully exploits this vulnerability can alter the API key used by the plugin, potentially disrupting AI content generation services or redirecting API usage to attacker-controlled accounts. This could lead to service denial or unauthorized usage of AI content generation resources, which may impact content workflows, marketing operations, or automated publishing processes. While confidentiality and availability impacts are limited, the integrity compromise could facilitate further attacks if the attacker leverages the altered API key to inject malicious content or manipulate generated outputs. Organizations in sectors relying heavily on automated content generation, such as media, marketing agencies, and e-commerce, may experience operational disruptions. Additionally, if the API key is linked to billing or usage quotas, unauthorized changes could incur financial costs. The requirement for administrator interaction reduces the likelihood of widespread exploitation but does not eliminate risk, especially in environments where administrators may be targeted via phishing or social engineering campaigns.

European organizations should immediately audit their WordPress installations to identify the presence of the Copymatic – AI Content Writer & Generator plugin and verify the version in use. Until an official patch is released, administrators should implement the following mitigations: 1) Restrict administrative access to trusted networks and users to reduce the risk of CSRF exploitation. 2) Educate administrators about the risks of clicking on untrusted links or visiting suspicious websites while logged into the WordPress admin panel. 3) Employ Web Application Firewalls (WAFs) with rules designed to detect and block CSRF attack patterns targeting the 'copymatic-menu' endpoint. 4) Manually inspect and harden the plugin code by adding nonce verification for all state-changing requests if feasible. 5) Monitor plugin configuration changes and API key usage logs for unusual activity. 6) Consider temporarily disabling the plugin if it is not critical to operations until a secure version is available. 7) Keep WordPress core and all plugins updated to minimize exposure to other vulnerabilities that could be chained with this CSRF flaw.