Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in Kestra OSS uses request.getPath().endsWith("/configs") to whitelist the public configuration endpoint from Basic Auth. Because the check is a suffix match rather than an exact path match, any API path whose last segment is configs bypasses authentication entirely. An unauthenticated remote attacker can exploit this to create and execute arbitrary workflows without credentials. Because Kestra ships with script execution plugins (plugin-script-shell, plugin-script-python, etc.) enabled by default, this directly results in unauthenticated Remote Code Execution as root inside the Kestra worker container. This vulnerability is fixed in 1.0.45 and 1.3.21.
Critical 10.0Actively exploited
CVE-2026-49869
Kestra Kestra OSS — OSS OS Command Injection.
Kestra is an open-source, event-driven orchestration platform.
Published Updated Source NVD and CISA KEV
CVSS 3.1
10.0
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploit chance, 30 days
2.1%
Higher than 81% of all CVEs (EPSS)
Status
Actively exploited
On CISA KEV since 2 Sep 2026
Patch
Unknown
Check the vendor advisory
What happened
What to do
- 01Check whether you run Kestra OSS, and which version.
- 02Follow the vendor advisory for a fix or a workaround.
- 03Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA deadlineUS federal agencies must remediate by
References
Timeline · UTC
- Published to NVD
- Added to CISA KEV
- CISA remediation deadline
- NVD record updated
Also actively exploited