What’s Vulnerable › Vulnerabilities

CVE-2026-53577: Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-26 · updated 2026-10-25
• Weakness: CWE-863

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.

Affected products

• kestra-io kestra: before 1.0.45; from 1.1.0 before 1.3.21 — fixed in 1.0.45, 1.3.21

How to fix

Upgrade to a fixed version: kestra-io kestra 1.0.45, 1.3.21. Check the vendor advisory for mitigations.

References

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

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