CVE-2026-49869
CriticalKestra OSS OS Command Injection Vulnerability
- Published
- Jun 26, 2026
- Updated
- Oct 25, 2026
- Vendor
- Kestra
- Affected versions
- See affected products
- Weakness
- CWE-78, CWE-184, CWE-287, CWE-918
Summary
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.
Severity
Critical (10.0)CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
- Kestra Kestra < 1.0.45
- Kestra Kestra >= 1.1.0, < 1.3.21
Exploitation status
Actively exploited
Listed in the CISA Known Exploited Vulnerabilities catalog on Sep 2, 2026. Federal remediation due: Sep 5, 2026.
Technical details
Technical analysis has not been written for this record yet.
Mitigation & remediation
- Apply 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.