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CVE-2026-53576

Kestra code injection

10.0 CRITICALPublic exploitEPSS 3.30%
  1. Published26 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Kestra≥ 1.1.0 < 1.3.21 · < 1.0.45

Remediation

Fixed in
Kestra≥ 1.3.21

References

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Frequently asked

Is CVE-2026-53576 being actively exploited?

CVE-2026-53576 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 3.30%.

How severe is CVE-2026-53576?

CVE-2026-53576 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 3.30% probability of exploitation.

Which products are affected by CVE-2026-53576?

Affected products include Kestra.

How do I fix CVE-2026-53576?

Upgrade affected software to a fixed version, for example Kestra 1.3.21 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.