CVE-2025-30976 in Nexa Blocks Plugin
Summary
by MITRE • 06/06/2025
Server-Side Request Forgery (SSRF) vulnerability in wpdive Nexa Blocks allows Server Side Request Forgery. This issue affects Nexa Blocks: from n/a through 1.1.0.
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Analysis
by VulDB Data Team • 06/06/2025
The CVE-2025-30976 vulnerability represents a critical server-side request forgery flaw within the wpdive Nexa Blocks plugin for WordPress. This vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly restrict external resource requests originating from the server. The flaw exists in the plugin's handling of user-supplied parameters that are directly used to construct HTTP requests without proper authorization checks or destination validation. Attackers can exploit this weakness to make unauthorized requests to internal network resources or external systems, potentially leading to data exfiltration, internal network reconnaissance, or further exploitation of vulnerable services. The vulnerability affects all versions of Nexa Blocks from the initial release through version 1.1.0, indicating a persistent flaw that has remained unpatched for an extended period.
The technical implementation of this SSRF vulnerability demonstrates a classic pattern where user-controllable input flows directly into server-side HTTP request construction functions. This type of flaw typically occurs when developers fail to validate or sanitize parameters that are used to determine the target URL or endpoint for external requests. The vulnerability aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate the destination of requests made on behalf of users. The attack vector likely involves manipulating parameters that control external API calls, file downloads, or resource fetching operations within the plugin's functionality. This weakness creates a pathway for attackers to bypass network segmentation and access internal systems that would normally be protected by firewalls or network access controls.
The operational impact of this vulnerability extends beyond simple data theft, as it enables attackers to perform reconnaissance activities against internal network infrastructure. An attacker could potentially use this vulnerability to enumerate internal services, access sensitive information stored on internal servers, or even escalate privileges by exploiting other vulnerabilities discovered through network scanning. The vulnerability affects WordPress installations that utilize the Nexa Blocks plugin, creating a significant risk for organizations that rely on WordPress for content management and web publishing. The long timeframe during which this vulnerability remained unpatched suggests that organizations may have been exposed to potential exploitation for months or years, particularly in environments where plugin updates are not regularly applied. This exposure creates opportunities for advanced persistent threats to establish footholds within networks and conduct extended reconnaissance activities.
Organizations affected by this vulnerability should immediately implement mitigation strategies including patching to the latest version of the Nexa Blocks plugin where available. Network segmentation and firewall rules should be configured to restrict outbound connections from web servers to prevent unauthorized external requests. Input validation should be strengthened to ensure that all parameters used in external request construction are properly sanitized and validated against known safe patterns. Additionally, monitoring and logging of external requests made by web applications should be implemented to detect anomalous behavior that might indicate exploitation attempts. Security teams should also consider implementing web application firewalls or similar protective measures that can detect and block known SSRF attack patterns. The vulnerability represents a significant risk that requires immediate attention and should be prioritized alongside other critical security issues in the organization's vulnerability management program. This flaw demonstrates the importance of regular security assessments and patch management processes to prevent exploitation of known vulnerabilities that can remain unaddressed for extended periods.