CVE-2026-0807 in Frontis Blocks Plugin
Summary
by MITRE • 01/24/2026
The Frontis Blocks plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 1.1.6. This is due to insufficient restriction on the 'url' parameter in the 'template_proxy' function. This makes it possible for unauthenticated attackers to make web requests to arbitrary locations originating from the web application via the '/template-proxy/' and '/proxy-image/' endpoint.
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Analysis
by VulDB Data Team • 01/25/2026
The Frontis Blocks plugin for WordPress presents a critical Server-Side Request Forgery vulnerability identified as CVE-2026-0807 affecting versions through 1.1.6. This flaw resides within the template_proxy function where the 'url' parameter lacks adequate input validation and sanitization measures. The vulnerability operates at the core of web application security by enabling malicious actors to manipulate the application's behavior through crafted requests that bypass normal access controls. The affected endpoints '/template-proxy/' and '/proxy-image/' serve as primary attack vectors that allow unauthorized users to initiate requests from the vulnerable web server to arbitrary destinations.
The technical implementation of this vulnerability stems from inadequate parameter validation within the plugin's proxy functionality. When the 'url' parameter is processed through the template_proxy function, no sufficient restrictions are applied to validate or sanitize the input before it is used in network requests. This creates a scenario where attackers can supply malicious URLs that the web application will then attempt to access on their behalf. The vulnerability manifests as a direct consequence of insufficient input filtering and validation practices that are fundamental to secure programming principles and align with CWE-918, which specifically addresses Server-Side Request Forgery vulnerabilities.
The operational impact of this vulnerability extends beyond simple data exfiltration as it provides attackers with the capability to perform various malicious activities through the compromised web server. Unauthenticated attackers can leverage this weakness to probe internal network resources, bypass firewall restrictions, and potentially gain access to sensitive systems that are normally protected from external access. The vulnerability creates a pathway for attackers to use the legitimate web application as an intermediary for their requests, making detection more difficult and potentially enabling further exploitation. This type of vulnerability directly maps to ATT&CK technique T1071.004 for Application Layer Protocol: DNS and T1566.001 for Phishing: Spearphishing Attachment, as it enables attackers to establish covert communication channels.
Security mitigation strategies should focus on implementing comprehensive input validation and sanitization measures within the plugin's proxy functions. The most effective immediate solution involves adding strict validation to the 'url' parameter to ensure it conforms to expected formats and restricts access to authorized domains only. Additionally, implementing network-level restrictions that prevent the web server from making outbound requests to internal network addresses would significantly reduce the attack surface. Organizations should also consider implementing web application firewalls with specific rules to block suspicious proxy requests and establish proper monitoring of outbound network connections from the web application server. The remediation process should include thorough code review and implementation of secure coding practices that prevent similar vulnerabilities from occurring in other components of the WordPress ecosystem.
The vulnerability demonstrates the critical importance of proper input validation in web applications and highlights how seemingly simple proxy functionality can become a significant security risk when not properly secured. This weakness represents a classic example of insufficient validation leading to dangerous behavior and underscores the necessity of following security best practices throughout the software development lifecycle. The impact extends beyond individual plugin installations to potentially affect entire WordPress deployments that rely on third-party plugins, making it essential for administrators to maintain current security patches and conduct regular security assessments of their web applications.