Kestra · Kestra · CVE-2026-53577
**Name of the Vulnerable Software and Affected Versions**
Kestra versions prior to 1.0.45
Kestra versions prior to 1.3.21
**Description**
An access control bypass exists in the `previewFileFromExecution` endpoint (GET '/api/v1/{tenant}/executions/{executionId}/file/preview'). This issue allows an authenticated user to read output files from any other execution within the same tenant, effectively bypassing namespace-level and execution-level isolation. This is an Insecure Direct Object Reference (IDOR), which occurs when an application provides direct access to objects based on user-supplied input.
**Recommendations**
Update to version 1.0.45.
Update to version 1.3.21.