Description

Subscriber Broken Access Control in App for Cloudflare® <= 1.10.1 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-10-06T09:17:46.333Z",
  "pubdate": "2026-10-06T09:17:46.333Z",
  "executiveSummary": "The App for Cloudflare plugin for WordPress contains a critical broken access control vulnerability affecting versions 1.10.1 and earlier.\nThis flaw originates from insufficient permission validation within the plugin's internal subscriber-level functions, allowing authenticated users with low-privileged subscriber accounts to execute restricted administrative actions.\nThe vulnerability poses a significant security risk, as it permits unauthorized users to modify plugin settings or interfere with Cloudflare configurations associated with the target WordPress installation.\nExploitation does not require elevated privileges or physical access to the server, as the attack is performed via HTTP requests through the application's interface.\nThe impact includes potential site degradation, misconfiguration of security protocols, or unauthorized access to sensitive plugin-managed data.\nSecurity teams should prioritize patching as the primary defense mechanism to ensure proper authorization checks are enforced for all user roles.",
  "technicalDetails": "The vulnerability is classified as an Improper Access Control issue, specifically within the plugin's request handling logic for subscriber roles.\nThe root cause lies in the application's failure to implement strict 'current_user_can()' checks or equivalent authorization middleware before processing administrative requests initiated by authenticated users.\nWhen a user with the 'subscriber' role submits a request to the affected component, the backend fails to verify the authorization level against the requested functionality. This oversight allows subscribers to invoke functions intended solely for site administrators.\nThe attack flow begins with an authenticated subscriber identifying the endpoint responsible for managing Cloudflare settings. By manipulating the parameters of a legitimate HTTP POST/GET request, the attacker can trigger the execution of unauthorized backend operations.\nSince the affected component does not differentiate between user roles, the application processes the request with the implicit trust assigned to an administrative function. This effectively bypasses the expected WordPress security model.\nExposure is limited to users who have registered accounts on the WordPress site. While this requires initial authentication, the barrier to entry is low, as subscriber registration is often enabled by default in many WordPress configurations.\nPost-exploitation, an attacker may disable Cloudflare protections, alter cache settings, or purge critical security caches, potentially leading to a denial-of-service condition or the exposure of sensitive underlying origin server information.\nThe vulnerability is present in versions 1.10.1 and earlier of the App for Cloudflare plugin. Remediation requires an upgrade to a version where explicit capability checks, such as 'manage_options', are integrated into all administrative endpoints."
}