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The User Registration & Membership  WordPress plugin before 4.1.2 does not prevent users to set their account role when the Membership Addon is enabled, leading to a privilege escalation issue and allowing unauthenticated users to gain admin privileges

CVE-2025-2563 is a high-severity vulnerability affecting the User Registration & Membership WordPress plugin versions prior to 4.1.2, specifically when the Membership Addon is enabled. The vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key. The core issue arises because the plugin does not properly restrict the ability of users to set their own account roles during registration. This flaw allows unauthenticated attackers to manipulate the user role parameter and escalate their privileges to administrator level without any authentication or user interaction. The vulnerability is remotely exploitable (AV:N) but requires high attack complexity (AC:H), meaning some specific conditions or knowledge are needed to exploit it. However, no privileges or user interaction are required (PR:N/UI:N), which significantly increases the risk. The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), as an attacker gaining admin privileges can fully control the WordPress site, access sensitive data, modify or delete content, install malicious code, and disrupt services. Although no known exploits are reported in the wild yet, the vulnerability is publicly disclosed and assigned a CVSS 3.1 score of 8.1, indicating a serious threat. The lack of a patch link suggests that a fixed version (4.1.2 or later) should be applied promptly once available. This vulnerability highlights a critical authorization bypass due to improper validation of user-controlled input in the role assignment process within the plugin's membership management functionality.

Detailed information about CVE-2025-2563: CWE-639 Authorization Bypass Through User-Controlled Key in User Registration & Membership affecting null User Registr

CVE-2025-2563: CWE-639 Authorization Bypass Through User-Controlled Key in User Registration & Membership - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-2563: CWE-639 Authorization Bypass Through User-Controlled Key in User Registration & Membership

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