CVE-2026-2589: Greenshift WordPress Info Disclosure Flaw

CVE-2026-2589 Overview

CVE-2026-2589 is a Sensitive Information Exposure vulnerability affecting the Greenshift – animation and page builder blocks plugin for WordPress in all versions up to and including 12.8.3. The vulnerability exists due to automated Settings Backup files being stored in a publicly accessible location, allowing unauthenticated attackers to extract sensitive API keys and credentials.

Critical Impact

Unauthenticated attackers can access publicly exposed backup files containing sensitive API keys for OpenAI, Claude, Google Maps, Gemini, DeepSeek, and Cloudflare Turnstile services, potentially leading to unauthorized API usage, financial charges, and further attacks on integrated services.

Affected Products

• Greenshift – animation and page builder blocks plugin for WordPress versions up to and including 12.8.3
• WordPress installations using vulnerable Greenshift plugin versions
• Integrated third-party services (OpenAI, Claude, Google Maps, Gemini, DeepSeek, Cloudflare Turnstile) with exposed API keys

Discovery Timeline

• 2026-03-06 - CVE CVE-2026-2589 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-2589

Vulnerability Analysis

This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The Greenshift plugin implements an automated settings backup feature that stores configuration data, including API keys, in a file that is accessible without authentication. This design flaw means that any attacker who can identify the backup file location can retrieve the stored credentials.

The exposed API keys pose significant risks beyond the WordPress site itself. Attackers obtaining these keys could incur substantial financial charges by abusing AI service APIs (OpenAI, Claude, Gemini, DeepSeek), access Google Maps APIs for unauthorized usage, or bypass CAPTCHA protections using the Cloudflare Turnstile credentials.

Root Cause

The root cause of this vulnerability is improper access control on the settings backup file. The Greenshift plugin stores backup data in a publicly accessible directory without implementing proper authentication checks, file permission restrictions, or access controls. The automated backup functionality does not consider the sensitivity of the data being stored or the security implications of making such files accessible to unauthenticated users.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying WordPress installations running vulnerable versions of the Greenshift plugin
2. Locating the publicly accessible settings backup file path
3. Directly requesting the backup file via HTTP to retrieve its contents
4. Extracting API keys and credentials from the backup data
5. Using the stolen credentials to access third-party services

The vulnerability is particularly dangerous because it can be exploited at scale by scanning for WordPress sites with the Greenshift plugin installed and automatically harvesting API credentials.

Detection Methods for CVE-2026-2589

Indicators of Compromise

• Unexpected access logs showing requests to Greenshift plugin backup file locations
• Unusual activity or billing spikes on connected API services (OpenAI, Claude, Google Maps, Gemini, DeepSeek, Cloudflare)
• Web server logs indicating automated scanning or enumeration of plugin directories
• Reports of unauthorized API key usage from third-party service providers

Detection Strategies

• Monitor web server access logs for requests to plugin backup files or unusual file access patterns in the /wp-content/plugins/greenshift/ directory
• Configure alerting on third-party API dashboards for abnormal usage patterns or requests from unexpected IP addresses
• Implement file integrity monitoring to detect unauthorized access to configuration or backup files
• Use WordPress security plugins to audit plugin file access and detect reconnaissance activity

Monitoring Recommendations

• Enable detailed logging for API key usage on all integrated third-party services
• Set up billing alerts and usage thresholds on AI services (OpenAI, Claude, Gemini, DeepSeek) to detect potential abuse
• Deploy web application firewall (WAF) rules to block direct access to backup files and sensitive plugin directories
• Regularly review API key access logs and revoke any keys showing suspicious activity

How to Mitigate CVE-2026-2589

Immediate Actions Required

• Update the Greenshift plugin to a version newer than 12.8.3 immediately
• Rotate all API keys that may have been exposed (OpenAI, Claude, Google Maps, Gemini, DeepSeek, Cloudflare Turnstile)
• Review access logs for evidence of unauthorized backup file access
• Remove any existing backup files from publicly accessible locations
• Audit billing statements for third-party API services for signs of unauthorized usage

Patch Information

A security patch addressing this vulnerability is available. The fix can be reviewed in the WordPress Changeset Update. Site administrators should update to the latest version of the Greenshift plugin through the WordPress admin dashboard or by downloading directly from the WordPress plugin repository.

For additional technical details about this vulnerability, refer to the Wordfence Vulnerability Report.

Workarounds

• Implement .htaccess or web server configuration rules to deny public access to plugin backup files and directories
• Temporarily disable the Greenshift plugin's backup functionality until the patch is applied
• Use server-level access controls to restrict access to WordPress plugin directories to authenticated administrators only
• Move any backup files to a location outside the web root where they cannot be accessed via HTTP requests

# Apache .htaccess example to block access to backup files
<FilesMatch "\.(json|bak|backup)$">
    Require all denied
</FilesMatch>

# Nginx configuration to block backup file access
location ~* \.(json|bak|backup)$ {
    deny all;
    return 403;
}