Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass_CVE-2026-53576

10 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Description

Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter for the REST API (@Filter("/api/v1/**")) treats any request whose path ends in /configs as the public instance-config endpoint and forwards it without a credential check. kestra addresses its resources by URL path segments that the caller chooses (/api/v1/{tenant}/flows/{namespace}, /api/v1/{tenant}/executions/{namespace}/{id}, /api/v1/{tenant}/namespaces/{namespace}/kv/{key}). An anonymous caller picks the literal configs as the final segment, and the request bypasses Basic-Auth entirely. Because the bypass reaches the flow-create and execution-trigger routes, an unauthenticated caller creates a flow containing a Shell or Process task and runs it. The task executes as root inside the kestra container. The official docker-compose.yml mounts /var/run/docker.sock, so root in the container reaches the host Docker daemon. This vulnerability is fixed in 1.0.45 and 1.3.21.

AI Analysis

Unauthenticated Remote Code Execution (RCE) via /configs path-suffix auth-filter bypass

Basic Information

ID CVE-2026-53576

Source GitHub_M

Published Jun 26, 2026 at 20:54

Affected Product

Vendor kestra-io

Product kestra

Version < 1.0.45

Affected Versions kestra-io kestra < 1.0.45
kestra-io kestra >= 1.1.0, < 1.3.21

CWE Classification

CWE-94 CWE-288

AI Assessment

AI Score 10 / 10

AI Severity Critical

Vendor kestra-io

Product Kestra

Version < 1.0.45, >= 1.1.0 and < 1.3.21

References

github.com /kestra-io/kestra/security/advisories/GHSA-2q47-568g-9h4f

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