CVE-2026-53577
Received Received - Intake
Access Control Bypass in Kestra Allows File Preview Exploitation

Publication date: 2026-06-26

Last updated on: 2026-06-26

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-06-26
Last Modified
2026-06-26
Generated
2026-06-27
AI Q&A
2026-06-27
EPSS Evaluated
N/A
NVD
CVE-2026-53577
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
kestra kestra to 1.0.45 (inc)
kestra kestra to 1.3.21 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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Executive Summary

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

Impact Analysis

This vulnerability can lead to unauthorized access to sensitive output files from other executions within the same tenant. An attacker with valid authentication could read data they should not have access to, potentially exposing confidential or sensitive information.

Mitigation Strategies

To mitigate this vulnerability, upgrade Kestra to version 1.0.45 or 1.3.21 or later, where the access control bypass issue in the previewFileFromExecution endpoint is fixed.

Compliance Impact

This vulnerability allows any authenticated user within the same tenant to bypass access controls and read output files from other executions, which compromises execution-level and namespace-level isolation.

Such unauthorized access to potentially sensitive data could lead to violations of data protection regulations like GDPR and HIPAA, which require strict access controls and data confidentiality.

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