How severe is CVE-2026-53577?

CVE-2026-53577 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-53577 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-53577?

CVE-2026-53577 affects Kestra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-53577?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-53577 published?

CVE-2026-53577 was published on 2026-06-26 and last updated on 2026-07-01.

CVE-2026-53577

CVE-2026-53577 is a medium-severity vulnerability in Kestra with a CVSS 3.x base score of 6.5. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Kestra
Published: 2026-06-26
Last modified: 2026-07-01

Description

Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the previewFileFromExecution endpoint (GET /api/v1/{tenant}/executions/{executionId}/file/preview) contains an access control bypass that allows any authenticated user to read output files from any other execution within the same tenant, bypassing execution-level and namespace-level isolation. This vulnerability is fixed in 1.0.45 and 1.3.21.

Frequently asked questions

What is CVE-2026-53577?: Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the previewFileFromExecution endpoint (GET /api/v1/{tenant}/executions/{executionId}/file/preview) contains an access control bypass that allows any authenticated user to read output files from any other execution within the same tenant, bypassing execution-level and namespace-level isolation. This vulnerability is fixed in 1.0.45 and 1.3.21.
How severe is CVE-2026-53577?: CVE-2026-53577 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-53577 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-53577?: CVE-2026-53577 affects Kestra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-53577?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-53577 published?: CVE-2026-53577 was published on 2026-06-26 and last updated on 2026-07-01.

References

https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42

Affected products (1)

cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*

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