Description

Unauthenticated Privilege Escalation in Tonda Membership <= 1.0.1 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-10-10T20:16:38.630Z",
  "pubdate": "2026-10-10T20:16:38.630Z",
  "executiveSummary": "The Tonda Membership plugin for WordPress, specifically versions 1.0.1 and below, contains a critical security vulnerability involving unauthenticated privilege escalation.\nThis flaw allows remote, unauthenticated attackers to manipulate user account permissions or register administrative accounts without requiring legitimate authorization.\nThe vulnerability stems from improper validation of incoming requests, potentially allowing an attacker to bypass security checks intended to restrict account creation or role assignment.\nThe impact of this vulnerability is severe, as it facilitates full unauthorized administrative access to the affected WordPress instance.\nSuccessful exploitation grants an attacker complete control over the site, enabling the execution of arbitrary administrative functions, data exfiltration, or the injection of malicious content.\nGiven that the exploit does not require authentication, it is highly accessible to attackers. Mitigation requires immediate update or disabling of the plugin until a vendor-supplied patch is applied.",
  "technicalDetails": "The vulnerability resides within the request handling logic of the Tonda Membership plugin (<= 1.0.1), which fails to implement robust nonce verification or sufficient session validation during administrative privilege assignment or account registration workflows.\nThe root cause is identified as an authorization bypass occurring during the processing of HTTP POST requests. The plugin lacks proper server-side validation to verify the legitimacy of the user submitting the registration data, allowing unauthenticated actors to pass parameters that override default user role assignment mechanisms.\nThe attack flow begins with an attacker crafting a malicious HTTP POST request targeted at the specific endpoint responsible for user registration or account modifications within the Tonda Membership plugin. Because the plugin fails to verify the presence of valid WordPress nonces or enforce authentication checks, the application processes the request as if it originated from an authorized user or an administrative form.\nAn attacker can manipulate user-controlled parameters, such as 'role' or 'user_level', to escalate their own or a newly created account to the 'administrator' role. By submitting this request to the server, the application logic directly interacts with the WordPress database to update user roles without verifying the session's privilege level.\nTechnically, the vulnerability exists because the code responsible for managing user roles assumes that the input is already pre-validated by administrative interface guards. Since these guards are absent or improperly implemented on the public-facing or unprotected registration/modification functions, the application becomes susceptible to privilege assignment manipulation.\nPost-exploitation, the attacker gains a functional administrative account. This allows for the installation of arbitrary plugins, modification of existing content, extraction of the site database, and potentially remote code execution (RCE) by leveraging legitimate administrative WordPress features such as theme or plugin editor access. The exposure is total and permanent until the malicious account is removed and the vulnerability is remediated."
}