How severe is CVE-2026-54321?

CVE-2026-54321 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2026-54321 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-54321?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-54321 have an EU (EUVD) identifier?

Yes. CVE-2026-54321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38565.

When was CVE-2026-54321 published?

CVE-2026-54321 was published on 2026-06-23 and last updated on 2026-06-25.

CVE-2026-54321

CVE-2026-54321 is a high-severity vulnerability with a CVSS 3.x base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-613.

Key facts

Severity: High (CVSS 3.x base score 7.0)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38565
Weakness: CWE-613
Published: 2026-06-23
Last modified: 2026-06-25

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.

Frequently asked questions

What is CVE-2026-54321?: 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.
How severe is CVE-2026-54321?: CVE-2026-54321 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2026-54321 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-54321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-54321 have an EU (EUVD) identifier?: Yes. CVE-2026-54321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38565.
When was CVE-2026-54321 published?: CVE-2026-54321 was published on 2026-06-23 and last updated on 2026-06-25.

References

https://github.com/daytonaio/daytona/security/advisories/GHSA-ww63-pv5x-vfc8

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