# Ghost v4.15.0 — Release & Upgrade Intelligence
- **Product:** Ghost (https://ghost.org)
- **Version:** v4.15.0
- **Released:** Sep 17, 2021
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/ghost/updates/v4.15.0/

## Executive Summary (TL;DR)
Ghost v4.15.0. Source highlight: ⚠️ 4.15.0 contains an important security fix - please see the advisory for details.

## Bug Fixes
- 🔒 Fixed remote command injection when using `sendmail` email transport - Daniel Lockyer
- 🐛 Fixed error in sitemap with >50k posts (#13317) - Hannah Wolfe
- 🐛 Fixed Outlook incorrect text styling and `'` appearing in email content (#13313) - Kevin Ansfield