CVE-2025-4177 in Flynax Bridge Plugin
Summary
by MITRE • 05/02/2025
The Flynax Bridge plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the deleteUser() function in all versions up to, and including, 2.2.0. This makes it possible for unauthenticated attackers to delete arbitrary users.
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Analysis
by VulDB Data Team • 05/02/2025
The vulnerability identified as CVE-2025-4177 affects the Flynax Bridge plugin for WordPress, representing a critical security flaw that undermines user account integrity and system confidentiality. This issue stems from an insufficient access control mechanism within the plugin's codebase, specifically targeting the deleteUser() function that lacks proper capability verification. The flaw exists across all versions of the plugin up to and including version 2.2.0, making it a widespread concern for WordPress installations utilizing this particular bridge solution. The vulnerability's severity is amplified by the fact that it operates without requiring any authentication credentials from attackers, creating an open pathway for malicious actors to exploit the system.
The technical implementation of this vulnerability resides in the deleteUser() function's failure to validate user permissions before executing destructive operations. According to CWE-284 access control vulnerabilities, this represents a direct violation of proper authorization checks where the system does not adequately verify that the requesting entity possesses sufficient privileges to perform the requested action. The absence of capability checks means that any external party can submit requests to the deleteUser() function and successfully delete user accounts without proper authentication. This flaw aligns with ATT&CK technique T1485 data destruction, as it enables unauthorized deletion of user data that can compromise system integrity and user privacy. The function's operation appears to accept user identifiers and proceed with deletion without verifying whether the request originates from an authenticated administrator or authorized user.
The operational impact of this vulnerability extends beyond simple data loss, creating cascading security implications for WordPress installations that rely on the Flynax Bridge plugin. Unauthenticated attackers can exploit this weakness to remove user accounts, potentially disrupting service availability, compromising user privacy, and undermining trust in the platform. The deletion of user accounts can lead to denial of service conditions, as legitimate users may lose access to their accounts and associated functionality. Additionally, this vulnerability can facilitate further attacks by allowing attackers to remove administrative accounts or users with specific privileges, thereby weakening overall system security. The attack surface is particularly concerning given that WordPress remains one of the most widely used content management systems, making installations vulnerable to this type of exploitation.
Mitigation strategies for CVE-2025-4177 must prioritize immediate action to address the root cause through code-level fixes. The most effective solution involves implementing proper capability checks within the deleteUser() function to ensure that only authenticated administrators with appropriate privileges can execute user deletion operations. This approach aligns with security best practices outlined in the OWASP Top Ten and follows the principle of least privilege. Organizations should also implement network-level protections such as rate limiting and access controls to prevent automated exploitation attempts. Regular security audits and vulnerability assessments should be conducted to identify similar authorization flaws in other plugin components. The patching process requires immediate attention from WordPress administrators, as the vulnerability affects all versions up to 2.2.0, and any installation running these versions should be upgraded to a patched release. Additionally, monitoring systems should be configured to detect unauthorized user deletion attempts, and incident response procedures should be established to address potential exploitation attempts.