This document explains how to contact the Let's Encrypt security team to report security vulnerabilities.
| Version | Supported |
|---|---|
| >= v3 | ✓ |
| v2 | ✗ |
| v1 | ✗ |
Please see https://letsencrypt.org/contact/#security for the email address to report a vulnerability. Ensure that the subject line for your report contains the word vulnerability and is descriptive. Your email should be acknowledged within 24 hours. If you do not receive a response within 24 hours, please follow-up again with another email.