CVE-2026-54321 Daytona: Public sandbox previews remain accessible for up to one hour after being made private
Attackers can access private sandbox previews without authentication for up to one hour after visibility changes due to cached state issues.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54321?
CVE-2026-54321 is a high-severity missing authorization vulnerability in daytonaio daytona, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Daytona is a secure and elastic infrastructure runtime for AI-generated code execution and agent workflows. From 0.101.0 until 0.184.0, sandbox previews that were switched from public to private could remain reachable without authentication for a short period after the change, due to a cached visibility state that was not invalidated when the sandbox's visibility changed. This vulnerability is fixed in 0.184.0.
Which versions are affected by CVE-2026-54321?
3 open source packages ship an affected version, including github.com/daytonaio/daytona.
| Package | Affected | Fixed in |
|---|---|---|
github.com/daytonaio/daytona Go | From 0.101.0 | 0.184.0 |
github.com/daytonaio/daytona Go | From 0.101.0 | 0.184.0 |
github.com/daytonaio/daytona Go | From 0.101.0 | 0.184.0 |
How do I fix CVE-2026-54321?
Upgrade github.com/daytonaio/daytona to 0.184.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-54321 being exploited?
There is no known exploitation of CVE-2026-54321 in the wild and no public exploit code.
Sources
Also known as GHSA-ww63-pv5x-vfc8, GO-2026-5729.