Description

Missing Authorization vulnerability in WP Desk Flexible Subscriptions flexible-subscriptions allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Flexible Subscriptions: from n/a through 1.8.4.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-10-12T09:16:42.577Z",
  "pubdate": "2026-10-12T09:16:42.577Z",
  "executiveSummary": "A missing authorization vulnerability has been identified in the WP Desk Flexible Subscriptions plugin (versions n/a through 1.8.4). This security flaw stems from improperly configured access control mechanisms, allowing unauthorized users to interact with restricted functionality. The vulnerability exposes the application to unauthorized state changes or data manipulation, potentially compromising the subscription management logic. Since the vulnerability involves a failure to enforce authorization checks, an attacker does not necessarily require high-level administrative privileges to execute operations that should be restricted to authorized users. The risk implication is significant as it allows for the subversion of subscription-based workflows, potentially leading to unauthorized service access or the modification of sensitive transaction-related data. Exploitation is facilitated by the absence of adequate server-side validation of the requester's identity and permission level, which is critical for protecting the integrity of the plugin's core functions. Organizations relying on this plugin should prioritize updating to a patched version to restore appropriate access controls and prevent potential exploitation.",
  "technicalDetails": "The vulnerability is classified as a Missing Authorization flaw, specifically stemming from the failure of the Flexible Subscriptions plugin to perform mandatory access control checks on specific sensitive administrative or user-facing functions. In WordPress plugin architecture, such vulnerabilities typically arise when hooks or request handlers, such as 'admin-ajax.php' or REST API endpoints, fail to verify the current user's capabilities (using functions like 'current_user_can()') or validate nonces before executing privileged code blocks.\nThe root cause lies in the insufficient enforcement of security levels within the internal request routing logic of Flexible Subscriptions. When a request is made to the vulnerable component, the application processes the action without verifying if the initiator possesses the required administrative or manager-level privileges. Consequently, the application assumes that any request directed to these endpoints is legitimate, thereby bypassing the intended security posture.\nThe attack flow commences with an attacker identifying the specific request parameters—such as 'action' names or REST API routes—associated with the plugin's subscription management features. Since these endpoints lack proper authorization checks, the attacker can craft unauthorized HTTP requests (GET or POST) to these paths. By manipulating these requests, an attacker can invoke backend functions that modify subscription statuses, alter pricing configurations, or access sensitive user subscription metadata without being logged in or authenticated as a privileged administrator.\nThe scope of this vulnerability encompasses the plugin's operational logic from version n/a through 1.8.4. Because the flaw exists within the plugin's handling of user-initiated requests, the attack surface is network-exposed, reachable by any user capable of interacting with the WordPress installation's frontend or backend AJAX/REST infrastructure. The post-exploitation impact includes, but is not limited to, the manipulation of active subscriptions, potential bypass of payment verification flows, and unauthorized administrative actions within the plugin's dashboard settings. The lack of proper server-side authentication allows an attacker to manipulate the state of the subscription environment, leading to a breakdown in access control integrity. This vulnerability highlights the necessity of strict adherence to the Principle of Least Privilege and the consistent implementation of WordPress security APIs, such as 'check_ajax_referer()' and 'current_user_can()', throughout all plugin modules to ensure that operations remain protected against unauthorized access."
}