Umbraco CMS 15 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Umbraco CMS 15 reached end of life on 14 Nov 2025. It no longer receives security fixes.
Support timeline
Official dates from the Umbraco CMS release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 14 Nov 2024 | — |
| End of life | 14 Nov 2025 | 0.7 years ago |
| Active support ended | 14 Aug 2025 | security fixes only after this |
| Latest release | 15.4.4 · 29 Jul 2025 | final |
Where to go from 15
Recommended target: Umbraco CMS 18 (supported until 25 Jun 2027).
The newest actively supported branch is Umbraco CMS 18 (latest release 18.1.0).
Frequently asked questions
Is Umbraco CMS 15 still safe to use?
Umbraco CMS 15 reached end of life on 14 Nov 2025, 268 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Umbraco CMS 15?
Yes — the final release (15.4.4) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Umbraco CMS 15 to?
Upgrade to Umbraco CMS 18, the newest actively supported branch (supported until 25 Jun 2027).