CVE-2024-4789 in Cost Calculator Builder Pro Plugin
Summary
by MITRE • 05/17/2024
Cost Calculator Builder Pro plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to 3.1.72, via the send_demo_webhook() function. This makes it possible for authenticated attackers, with subscriber-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
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Analysis
by VulDB Data Team • 06/05/2026
The Cost Calculator Builder Pro plugin for WordPress represents a significant security vulnerability through its implementation of the send_demo_webhook() function, which exposes the system to server-side request forgery attacks. This flaw affects all versions up to 3.1.72 and creates a dangerous pathway for authenticated attackers who possess subscriber-level privileges or higher. The vulnerability stems from insufficient input validation and sanitization within the webhook functionality, allowing malicious users to manipulate the plugin's behavior to initiate requests to arbitrary destinations. The technical nature of this flaw aligns with CWE-918, which categorizes server-side request forgery as a critical security weakness where applications make untrusted requests to internal services. This weakness enables attackers to bypass network segmentation and access internal resources that would normally be protected from external access.
The operational impact of this vulnerability extends far beyond simple data exfiltration, as it provides attackers with the capability to perform reconnaissance on internal network services and potentially exploit additional vulnerabilities within the internal infrastructure. When an authenticated user with subscriber privileges or higher triggers the send_demo_webhook() function, the malicious request can originate from the web application server itself, making it difficult to trace back to the actual attacker. This characteristic enables attackers to enumerate internal services, test for vulnerabilities in internal systems, and potentially escalate their privileges further by exploiting weaknesses in internal applications. The vulnerability's exploitation can result in unauthorized access to sensitive internal resources, data manipulation, and potential lateral movement within the network environment. According to ATT&CK framework, this vulnerability maps to T1071.004 for application layer protocols and T1566 for phishing techniques, as attackers can leverage this weakness to craft more sophisticated attacks targeting internal systems.
Mitigation strategies for this vulnerability require immediate attention through plugin version updates to the latest secure release, which should include proper input validation and sanitization measures. Organizations should implement network segmentation to isolate the WordPress installation from critical internal services, thereby limiting the potential impact of successful exploitation. Additionally, implementing web application firewalls with rules specifically designed to detect and block suspicious webhook requests can provide an additional layer of protection. Access control measures should be reviewed to ensure that only trusted users have subscriber-level privileges, as this vulnerability requires at least this level of access to be exploited. The implementation of proper logging and monitoring around webhook functionality can help detect anomalous behavior and potential exploitation attempts. Security teams should also conduct regular vulnerability assessments and penetration testing to identify similar weaknesses in other plugins and applications within the WordPress ecosystem. Organizations utilizing this plugin should also consider implementing principle of least privilege access controls and regularly review user permissions to minimize potential attack surface. The vulnerability underscores the importance of validating all external inputs and implementing proper request origin verification mechanisms within web applications.