CVE-2025-5392 in GB Forms DB Plugin
Summary
by MITRE • 07/11/2025
The GB Forms DB plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.0.2 via the gbfdb_talk_to_front() function. This is due to the function accepting user input and then passing that through call_user_func(). This makes it possible for unauthenticated attackers to execute code on the server which can be leverage to inject backdoors or create new administrative user accounts to name a few things.
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Analysis
by VulDB Data Team • 07/11/2025
The GB Forms DB plugin for WordPress presents a critical remote code execution vulnerability that affects all versions up to and including 1.0.2. This flaw resides within the gbfdb_talk_to_front() function which processes user input without proper sanitization or validation. The vulnerability stems from the function's reliance on call_user_func() to execute dynamically constructed function names, creating an exploitable path where attacker-controlled input can be directly executed as PHP code. The issue is particularly severe because it operates without authentication requirements, allowing any remote attacker to leverage this vulnerability.
The technical implementation of this vulnerability demonstrates a classic insecure function call pattern that aligns with CWE-94, which describes the execution of code from untrusted sources. The gbfdb_talk_to_front() function accepts parameters from user input and subsequently passes these parameters directly to call_user_func(), bypassing all input validation mechanisms. This design flaw creates a direct code execution pathway where malicious actors can inject arbitrary PHP commands through crafted input parameters. The vulnerability is classified as a remote code execution issue under the ATT&CK framework with techniques such as T1059.007 for command and script injection, making it a significant threat to WordPress installations.
The operational impact of this vulnerability extends far beyond simple code execution capabilities. Attackers can leverage this flaw to establish persistent backdoors within affected systems, create new administrative user accounts with full privileges, or manipulate database contents to compromise the entire WordPress installation. The unauthenticated nature of the attack means that any user with access to the vulnerable plugin interface can exploit this vulnerability without requiring prior credentials or access rights. This makes the attack surface particularly broad and dangerous for WordPress sites that have not updated to patched versions of the GB Forms DB plugin.
Mitigation strategies for this vulnerability require immediate action including updating to the latest version of the GB Forms DB plugin where the vulnerability has been addressed. Organizations should implement network-level protections such as web application firewalls that can detect and block malicious payloads targeting this specific vulnerability pattern. Additionally, regular security audits should include checks for outdated plugins and themes that may present similar insecure function call patterns. The vulnerability highlights the importance of proper input validation and the avoidance of dynamic function calls in web applications, emphasizing the need for secure coding practices that prevent user-supplied data from being executed as code. Security teams should also consider implementing monitoring solutions that can detect unusual execution patterns or unauthorized administrative account creation that may indicate exploitation attempts.