Drupal i18n sso Authentication Bypass Vulnerability Exploit

This module performs the following steps: 1. Checks whether the Drupal i18n_sso token endpoint is present. 2. Submits a random token as a negative control and verifies that it is rejected. 3. Sends unauthenticated wildcard-token requests to the Drupal i18n_sso login endpoint. 4. Repeats the wildcard request according to MAX ATTEMPTS and POLL INTERVAL until a matching active token is found. 5. Confirms the authentication bypass only when Drupal reports success and returns a valid Drupal session cookie. 6. Uses the acquired session to identify the authenticated Drupal account. 7. Stores the session cookie as an Impact identity and records CVE-2026-16639 on the target.