Description

The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.8.16 due to a missing capability check in the `ai_ajax` function. This makes it possible for unauthenticated attackers to view the contents of ad blocks that an administrator has restricted to administrator-only visibility.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.3",
  "pubDate": "2026-08-06T12:16:26.813Z",
  "pubdate": "2026-08-06T12:16:26.813Z",
  "executiveSummary": "An authorization bypass vulnerability exists within the Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress, impacting all versions up to and including 2.8.16. The vulnerability stems from a missing capability check within a specific AJAX handling function, allowing unauthenticated remote threat actors to interact with restricted endpoints.\nThe primary impact of this security defect is the unauthorized disclosure of sensitive data. Specifically, unauthenticated attackers can successfully view the contents of ad blocks that have been explicitly restricted by an administrator to administrator-only visibility.\nThis flaw introduces significant risk implications, as restricted ad blocks may contain sensitive information, internal system data, proprietary marketing strategies, or configuration strings intended solely for privileged personnel. The attacker capabilities are limited to reading restricted content, but require zero authentication or prior system privileges, lowering the barrier to exploitation significantly.",
  "technicalDetails": "The vulnerability resides in the backend processing logic of the Ad Inserter – Ad Manager & AdSense Ads plugin, specifically within the ai_ajax function. Root cause analysis indicates a failure in proper access control enforcement, characterized by a missing capability check prior to executing sensitive code routines. In WordPress plugin architecture, AJAX actions intended for privileged administrators must explicitly validate user roles and permissions using functions such as current_user_can() alongside proper nonce verification.\nBecause the ai_ajax function lacks these mandatory security checks, any incoming HTTP request targeting this AJAX endpoint is processed regardless of the sender's authentication status or privilege level. The network exposure is public-facing, meaning any remote attacker with network access to the target WordPress site can interact with the vulnerable endpoint over standard HTTP or HTTPS protocols.\nThe attack flow proceeds as follows: First, an unauthenticated threat actor crafts an HTTP request directed at the WordPress AJAX routing mechanism, specifying parameters designed to invoke the vulnerable ai_ajax function. Second, the plugin processes the request without validating whether the sender possesses administrator privileges. Third, the function retrieves and renders the requested ad blocks. Finally, the response containing the ad block contents—including those restricted exclusively to administrator-only visibility—is returned directly to the unauthenticated attacker, completing the unauthorized data retrieval process.\nThe vulnerable component is the AJAX request handler associated with the Ad Inserter – Ad Manager & AdSense Ads plugin. Affected versions comprise all releases up to and including 2.8.16. The vulnerability requires no authentication and no specific privileges, functioning entirely over the network via standard web requests to yield unauthorized read access to restricted data structures."
}