CVE-2026-0807 is a Server-Side Request Forgery (SSRF) vulnerability classified under CWE-918, found in the Frontis Blocks — Block Library for the Block Editor WordPress plugin developed by wpmessiah. This vulnerability affects all versions up to and including 1.1.6. The root cause is insufficient restriction and validation of the 'url' parameter within the 'template_proxy' function. This flaw allows unauthenticated attackers to abuse the '/template-proxy/' and '/proxy-image/' endpoints to make arbitrary HTTP requests originating from the vulnerable web server. SSRF vulnerabilities enable attackers to interact with internal systems that are otherwise inaccessible externally, potentially leading to information disclosure, internal network scanning, or leveraging the server as a proxy for further attacks. The vulnerability does not require any authentication or user interaction, increasing its exploitability. The CVSS v3.1 score is 7.2 (high severity), reflecting the network attack vector, low attack complexity, no privileges required, no user interaction, and impacts on confidentiality and integrity but not availability. Although no known exploits have been reported in the wild, the vulnerability's presence in a popular WordPress plugin makes it a significant risk for websites using this plugin. The lack of available patches at the time of reporting necessitates immediate mitigation efforts by administrators.

For European organizations, exploitation of this SSRF vulnerability could lead to unauthorized internal network reconnaissance, exposing sensitive internal services and data. Attackers could use the vulnerable WordPress plugin to pivot into internal systems, bypassing perimeter defenses. This could result in leakage of confidential information, compromise of internal APIs, or further exploitation chains leading to data breaches. Given the widespread use of WordPress across European businesses, government websites, and public institutions, the impact could be broad, affecting sectors such as finance, healthcare, and public administration. Additionally, the ability to make arbitrary requests from the server could be leveraged to bypass IP-based access controls or to perform denial-of-service attacks against internal or third-party systems. The high severity rating underscores the potential for significant confidentiality and integrity impacts, which could damage organizational reputation and lead to regulatory penalties under GDPR if personal data is exposed.

1. Immediately update the Frontis Blocks plugin to a patched version once available from the vendor. 2. Until a patch is released, restrict access to the '/template-proxy/' and '/proxy-image/' endpoints using web application firewalls (WAFs) or server-level access controls to block unauthenticated requests. 3. Implement strict input validation and sanitization on the 'url' parameter to ensure only allowed domains or IP ranges can be requested, ideally whitelisting trusted URLs. 4. Monitor web server logs for unusual outbound HTTP requests originating from these endpoints, which may indicate exploitation attempts. 5. Employ network segmentation to limit the web server's ability to reach sensitive internal resources. 6. Use security plugins or modules that detect and block SSRF attempts. 7. Educate site administrators about the risks and signs of SSRF exploitation. 8. Conduct regular vulnerability scans and penetration tests focusing on SSRF and related web application vulnerabilities.