CVE-2025-6792 identifies a vulnerability in the 'One to one user Chat by WPGuppy' WordPress plugin developed by amentotechpvtltd. The vulnerability stems from a missing capability check on the REST API endpoint /wp-json/guppylite/v2/channel-authorize, which is responsible for authorizing chat channels between users. Because this endpoint lacks proper authentication and authorization controls, unauthenticated attackers can invoke it to intercept and view private chat messages exchanged between users. This issue affects all plugin versions up to and including 1.1.4. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function), indicating that a critical function is exposed without verifying the identity or privileges of the requester. The CVSS v3.1 base score is 5.3 (medium severity), with vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, meaning the attack can be performed remotely over the network with low complexity, no privileges, and no user interaction, impacting confidentiality only. No patches or fixes are currently published, and no known exploits have been reported in the wild. The vulnerability could allow attackers to breach user privacy by reading private chat messages, potentially leading to information disclosure and reputational damage for affected sites. The plugin is commonly used in WordPress environments to facilitate direct user-to-user chat functionality, making this vulnerability particularly sensitive for websites relying on private communications.

For European organizations, this vulnerability poses a significant risk to the confidentiality of private communications conducted via the affected WordPress plugin. Organizations using this plugin for internal collaboration, customer support, or community engagement could have sensitive chat data exposed to unauthorized third parties. This could lead to breaches of data protection regulations such as the GDPR, resulting in legal penalties and loss of customer trust. The exposure of private messages may also facilitate further social engineering or targeted attacks. Since the vulnerability requires no authentication and can be exploited remotely, the attack surface is broad, especially for publicly accessible WordPress sites. The impact is primarily on confidentiality, with no direct effect on data integrity or availability. However, the reputational damage and potential regulatory consequences could be severe. European organizations with high reliance on WordPress and this specific plugin should consider this vulnerability a priority for remediation to avoid data leakage incidents.

1. Immediately audit WordPress sites to identify installations of the 'One to one user Chat by WPGuppy' plugin, especially versions up to 1.1.4. 2. Disable or uninstall the plugin until an official patch or update is released by the vendor. 3. If disabling the plugin is not feasible, restrict access to the /wp-json/guppylite/v2/channel-authorize REST endpoint using web application firewall (WAF) rules or server-level access controls to block unauthenticated requests. 4. Monitor web server and application logs for suspicious access attempts to the vulnerable endpoint. 5. Apply the principle of least privilege by limiting plugin usage to trusted users and minimizing exposure of chat functionality on public-facing sites. 6. Stay informed about vendor updates and apply patches promptly once available. 7. Consider implementing additional encryption or secure messaging alternatives for sensitive communications. 8. Conduct user awareness training to recognize potential phishing or social engineering attempts that could leverage exposed chat data. 9. Review and update incident response plans to include scenarios involving unauthorized data access via plugin vulnerabilities.