CVE-2025-68033 is a vulnerability classified under CWE-201, which pertains to the insertion of sensitive information into sent data. This flaw exists in the Brecht Custom Related Posts plugin, a WordPress plugin used to display related posts on websites. Versions up to 1.8.0 are affected, although the exact range is unspecified (noted as 'n/a'). The vulnerability allows an unauthenticated remote attacker to retrieve sensitive information embedded in the data sent by the plugin. According to the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), the attack can be performed over the network with low attack complexity, requires no privileges or user interaction, and impacts confidentiality severely, but does not affect integrity or availability. The vulnerability likely arises from improper handling or exposure of sensitive data within the plugin’s output, possibly through URL parameters, API responses, or page content. No patches or fixes have been published yet, and no known exploits have been observed in the wild. The vulnerability was reserved in December 2025 and published in January 2026, indicating recent discovery and disclosure. The lack of authentication and user interaction requirements makes this a significant risk for websites using this plugin, as sensitive data leakage could lead to information disclosure that may facilitate further attacks or privacy violations.

For European organizations, this vulnerability poses a substantial risk of sensitive data leakage from websites using the Brecht Custom Related Posts plugin. The confidentiality breach could expose user data, internal identifiers, or other sensitive information embedded in the plugin’s output. This could lead to privacy violations under GDPR, reputational damage, and potential regulatory penalties. Organizations relying on WordPress for content management, especially those in sectors handling sensitive or personal data (e.g., healthcare, finance, government), are at heightened risk. The vulnerability does not affect data integrity or availability, so direct service disruption or data tampering is unlikely. However, the exposed information could be leveraged by attackers for targeted phishing, social engineering, or further exploitation. Since exploitation requires no authentication or user interaction, any publicly accessible site using the vulnerable plugin is exposed. The absence of patches means organizations must rely on interim mitigations until a fix is released. Overall, the impact is primarily on confidentiality with potential cascading effects on organizational security posture and compliance.

1. Immediately audit all WordPress sites to identify installations of the Brecht Custom Related Posts plugin and determine their versions. 2. Restrict access to pages or endpoints that expose related posts data, using web application firewalls (WAFs) or access control rules to limit exposure to trusted users or IP ranges. 3. Monitor network traffic and logs for unusual requests targeting the plugin’s endpoints or parameters that might indicate exploitation attempts. 4. Temporarily disable or remove the plugin if it is not critical to website functionality until a vendor patch is available. 5. Engage with the plugin vendor or community to obtain updates or patches as soon as they are released. 6. Implement content security policies and data sanitization to minimize sensitive data exposure in web responses. 7. Educate web administrators about the vulnerability and encourage timely updates and security best practices. 8. Consider deploying runtime application self-protection (RASP) tools to detect and block attempts to exploit this vulnerability. 9. Review and minimize sensitive data embedded in web content or plugin outputs to reduce risk exposure. 10. Prepare incident response plans to address potential data leakage incidents resulting from this vulnerability.