Umbraco CMS 18 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Supported
Umbraco CMS 18 is actively supported. It reaches end of life on 25 Jun 2027.
263 days of security support left
18.2.0 latest release
28% of this branch's supported lifetime has elapsed — 25 Jun 2026 → 25 Jun 2027.
Support timeline
Official dates from the Umbraco CMS release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 25 Jun 2026 | 3mo ago |
| Support ended | 25 Mar 2027 | security fixes only after this |
| Security ends | 25 Jun 2027 | in 9mo |
| Latest release | 18.2.0 · 17 Sept 2026 | current |
How much runway a newer branch buys
Umbraco CMS 18 is the newest branch — this is the longest runway currently available.
| Branch | End of life | Days left | vs 18 |
|---|---|---|---|
| Umbraco CMS 18 | 25 Jun 2027 | 263 | this branch |
| Umbraco CMS 17 | 27 Nov 2028 | 784 | +521 days |
| Umbraco CMS 13 | 14 Dec 2026 | 70 | -193 days |
Frequently asked questions
When does Umbraco CMS 18 reach end of life?
Umbraco CMS 18 reaches end of life on 25 Jun 2027 — 263 days from now. After that date it receives no security fixes.
Is Umbraco CMS 18 still supported?
Yes. Umbraco CMS 18 is currently maintained. Latest release: 18.2.0, published 17 Sept 2026.
What happens when Umbraco CMS 18 reaches end of life?
Security fixes stop. After 25 Jun 2027 this branch receives no further updates under standard support.
How long do I have to upgrade from Umbraco CMS 18?
263 days. This is already the newest branch, so this is the longest runway currently available.