CVE-2026-53577: CWE-863: Incorrect Authorization in kestra-io kestra
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.
AI Analysis
Technical Summary
CVE-2026-53577 is an incorrect authorization vulnerability (CWE-863) in the Kestra orchestration platform. Specifically, the GET /api/v1/{tenant}/executions/{executionId}/file/preview endpoint does not properly enforce access controls, enabling authenticated users to access output files from other executions within the same tenant. This bypasses execution-level and namespace-level isolation controls. The issue affects Kestra versions before 1.0.45 and 1.3.21 and has been resolved in those fixed versions.
Potential Impact
An attacker with valid authentication credentials in the same tenant can read output files from any execution, potentially exposing sensitive data. The vulnerability does not affect integrity or availability but impacts confidentiality. The CVSS v3.1 base score is 6.5 (medium severity), reflecting network attack vector, low attack complexity, and no user interaction required.
Mitigation Recommendations
Upgrade Kestra to version 1.0.45 or later, or 1.3.21 or later, where this access control bypass vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed by the fixed versions stated in the description.
CVE-2026-53577: CWE-863: Incorrect Authorization in kestra-io kestra
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.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/kestra-io/kestraRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53577 is an incorrect authorization vulnerability (CWE-863) in the Kestra orchestration platform. Specifically, the GET /api/v1/{tenant}/executions/{executionId}/file/preview endpoint does not properly enforce access controls, enabling authenticated users to access output files from other executions within the same tenant. This bypasses execution-level and namespace-level isolation controls. The issue affects Kestra versions before 1.0.45 and 1.3.21 and has been resolved in those fixed versions.
Potential Impact
An attacker with valid authentication credentials in the same tenant can read output files from any execution, potentially exposing sensitive data. The vulnerability does not affect integrity or availability but impacts confidentiality. The CVSS v3.1 base score is 6.5 (medium severity), reflecting network attack vector, low attack complexity, and no user interaction required.
Mitigation Recommendations
Upgrade Kestra to version 1.0.45 or later, or 1.3.21 or later, where this access control bypass vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed by the fixed versions stated in the description.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-09T19:11:53.484Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3eed5627e9c79719f4053b
Added to database: 06/26/2026, 21:21:26 UTC
Last enriched: 07/03/2026, 22:36:04 UTC
Last updated: 08/10/2026, 12:41:12 UTC
Views: 84
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