CVE-2026-49984
HighCVSS 7.7Exploitation Probability (EPSS)
Low risk29th percentile — higher than 29% of all known CVEs
Summary
In Kestra before versions 1.0.45 and 1.3.23, the local internal-storage backend improperly validates user-supplied paths, allowing an attacker to smuggle a traversal sequence using backslashes (..\..\..\) before conversion to forward slashes. An authenticated user with the lowest privilege can read any file on the server filesystem, including the H2 database, stored secrets, and credentials.
Risk Assessment
The organization faces a complete breach of storage isolation and multi-tenancy boundaries, potentially leading to exposure of all flows, users, secrets, and database/secret-backend credentials.
Recommendation
Immediately upgrade Kestra to version 1.0.45 or 1.3.23, which fix the path traversal vulnerability.
Original NVD description (English source)
Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.23, the local internal-storage backend validates user-supplied paths for .. traversal before it converts Windows-style backslashes to forward slashes. An attacker can therefore smuggle a traversal sequence past the guard using backslashes (..\..\..\); the guard sees a harmless string, and the path is only rewritten to ../../../ after validation, immediately before the file is opened. Any authenticated user who can view an execution (the lowest-privilege role) can call GET /api/v1/{tenant}/executions/{executionId}/file?path=… and read any file on the server filesystem readable by the Kestra process, outside the storage sandbox and across every tenant and namespace. This includes the embedded H2 database (all flows, all users, all stored secrets), internal storage of every other tenant/namespace, mounted secret files, and the process environment (/proc/self/environ) which contains configured database and secret-backend credentials. It is a complete breach of Kestra's storage isolation and multi-tenancy boundary. This vulnerability is fixed in 1.0.45 and 1.3.23.