CVE-2026-3058: Seraphinite Accelerator Info Disclosure

CVE-2026-3058 Overview

The Seraphinite Accelerator plugin for WordPress contains a Sensitive Information Exposure vulnerability affecting all versions up to and including 2.28.14. The vulnerability exists in the seraph_accel_api AJAX action when using the fn=GetData parameter. Due to missing capability checks in the OnAdminApi_GetData() function, authenticated attackers with Subscriber-level access or above can retrieve sensitive operational data from the WordPress site.

Critical Impact

Authenticated users with minimal privileges (Subscriber-level) can access sensitive internal system information including cache status, scheduled task configurations, and external database connection states. This information disclosure could facilitate further attacks against the WordPress installation.

Affected Products

• Seraphinite Accelerator WordPress Plugin versions up to and including 2.28.14

Discovery Timeline

• 2026-03-04 - CVE-2026-3058 published to NVD
• 2026-03-04 - Last updated in NVD database

Technical Details for CVE-2026-3058

Vulnerability Analysis

This vulnerability is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The core issue stems from an authorization bypass in the plugin's administrative API functionality. The OnAdminApi_GetData() function processes requests through the seraph_accel_api AJAX endpoint without validating whether the requesting user has appropriate administrative capabilities.

In WordPress, AJAX actions registered with the wp_ajax_ prefix are accessible to any authenticated user. When these endpoints handle sensitive administrative data, they must implement proper capability checks using functions like current_user_can(). The Seraphinite Accelerator plugin fails to implement these checks, allowing any authenticated user—including those with the lowest privilege level (Subscriber)—to invoke the GetData function and retrieve operational information that should only be accessible to administrators.

Root Cause

The root cause is the absence of authorization controls in the OnAdminApi_GetData() function. The function processes the fn=GetData request without first verifying that the authenticated user possesses administrative capabilities. This missing authorization check allows low-privileged users to access endpoints designed exclusively for site administrators.

Attack Vector

The attack is network-accessible and requires only low-privilege authentication (Subscriber-level). An attacker can exploit this vulnerability by:

1. Registering or compromising a Subscriber-level account on a WordPress site running the vulnerable plugin
2. Sending a crafted AJAX request to the seraph_accel_api endpoint with the fn=GetData parameter
3. Receiving sensitive operational data in the response, including cache status, scheduled task information, and external database state

The disclosed information could reveal infrastructure details, performance configurations, and connected external services, potentially enabling reconnaissance for more sophisticated attacks.

Detection Methods for CVE-2026-3058

Indicators of Compromise

• Unusual AJAX requests to wp-admin/admin-ajax.php with action parameter seraph_accel_api from non-administrative users
• Log entries showing Subscriber or Contributor accounts accessing the GetData function
• Repeated requests to the seraph_accel_api endpoint that pattern-match enumeration attempts

Detection Strategies

• Monitor WordPress access logs for requests containing action=seraph_accel_api and fn=GetData parameters originating from users without administrative roles
• Implement Web Application Firewall (WAF) rules to flag suspicious AJAX requests targeting plugin-specific endpoints from low-privilege users
• Review WordPress audit logs for authentication events followed by immediate requests to sensitive plugin endpoints

Monitoring Recommendations

• Enable detailed access logging on WordPress sites to capture full request parameters for AJAX actions
• Configure alerting for AJAX endpoint access patterns that deviate from normal administrative usage
• Implement user activity monitoring to track requests made by Subscriber and Contributor-level accounts to administrative endpoints

How to Mitigate CVE-2026-3058

Immediate Actions Required

• Update the Seraphinite Accelerator plugin to the latest patched version immediately
• Audit user accounts and remove unnecessary Subscriber or Contributor accounts that are no longer needed
• Review access logs for evidence of exploitation attempts prior to patching
• Consider temporarily disabling the plugin until the update can be applied if immediate patching is not possible

Patch Information

A security patch has been released to address this vulnerability. The fix is documented in the WordPress Plugin Changeset. Site administrators should update to the latest version of the Seraphinite Accelerator plugin through the WordPress plugin update interface. Additional technical details are available in the Wordfence Vulnerability Report.

Workarounds

• Restrict user registration on WordPress sites to prevent attackers from obtaining authenticated access as Subscribers
• Implement IP-based access controls to limit AJAX endpoint access to trusted networks
• Deploy a Web Application Firewall with rules blocking unauthorized access to the seraph_accel_api endpoint
• Temporarily disable the Seraphinite Accelerator plugin if it is not critical to site operations until the patch can be applied