Description

Missing Authorization vulnerability in BdThemes Ultimate Post Kit ultimate-post-kit allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Ultimate Post Kit: from n/a through 4.5.5.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-10-08T13:17:13.403Z",
  "pubdate": "2026-10-08T13:17:13.403Z",
  "executiveSummary": "A Missing Authorization vulnerability has been identified in the BdThemes Ultimate Post Kit plugin, affecting versions from n/a through 4.5.5.\nThis vulnerability stems from incorrectly configured access control checks within the plugin's functionality, allowing unauthorized users to execute sensitive operations.\nThe flaw exposes the affected WordPress installations to potential unauthorized actions, as the plugin fails to properly validate the authorization levels of the request initiator.\nAn unauthenticated or low-privileged attacker could exploit this deficiency to manipulate plugin settings, exfiltrate data, or perform other administrative functions typically restricted to authorized users.\nThe risk implication is significant, as it permits attackers to bypass the intended security boundaries established by the WordPress access control model.\nThere are no complex exploitation requirements; the attacker simply needs to interact with the vulnerable endpoint or function, which is reachable over the network.\nGiven the nature of the flaw, it is imperative to restrict access or apply updates to restore proper authorization controls.",
  "technicalDetails": "The vulnerability resides in the Ultimate Post Kit plugin, specifically within the implementation of its internal request handlers and administrative interface controllers.\nThe root cause is a failure to perform adequate security checks (specifically authorization checks) before processing requests directed at specific plugin functionalities.\nIn WordPress plugin development, security best practices dictate that all administrative or sensitive actions must invoke current_user_can() or similar capability checks to ensure the initiator possesses the requisite permissions to execute the action.\nIn this instance, the plugin's code fails to properly enforce these restrictions. This missing authorization allows any user, including unauthenticated entities, to invoke functions that should be gated behind administrative privileges.\nThe attack flow typically involves an attacker identifying the specific API endpoints or AJAX actions exposed by the Ultimate Post Kit plugin. By crafting malicious HTTP POST or GET requests targeting these exposed endpoints, an attacker can bypass the intended access control mechanisms.\nBecause the plugin lacks the necessary validation logic, the server executes the requested operation as if the request were authorized, effectively disregarding the user's actual security role.\nThe technical impact is extensive. An attacker could potentially modify plugin configurations, alter display settings, or trigger plugin-specific data processing tasks. Depending on the exposed functionality, this might lead to the unauthorized retrieval of sensitive information or the performance of administrative tasks that compromise the integrity of the WordPress site.\nThe vulnerability is present across all versions of the Ultimate Post Kit plugin from initial release up to and including version 4.5.5.\nExploitation is possible over the network, as the vulnerable entry points are part of the web application surface accessible via standard HTTP/HTTPS protocols.\nThe flaw resides in the handling of plugin requests, indicating that the vulnerability is inherent to the plugin's architecture rather than a configuration error by the user.\nPost-exploitation, the attacker has the ability to maintain persistence or further escalate their impact on the site, depending on the breadth of functionality exposed by the vulnerable endpoints."
}