CVE-2026-49869: Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Kestra OSSto a version that resolves this vulnerability.Fixed in 1.0.45 - Upgrade
Upgrade
Kestra OSSto a version that resolves this vulnerability.Fixed in 1.3.21
Event History
Frequently Asked Questions
What is the severity of CVE-2026-49869?
The severity of CVE-2026-49869 is rated as critical with a score of 10.
How do I fix CVE-2026-49869?
To fix CVE-2026-49869, upgrade to Kestra version 1.0.45 or 1.3.21 or later.
What type of vulnerability is CVE-2026-49869?
CVE-2026-49869 is an unauthenticated remote code execution vulnerability caused by an authentication bypass.
Which versions of Kestra are affected by CVE-2026-49869?
Kestra versions prior to 1.0.45 and 1.3.21 are affected by CVE-2026-49869.
What kind of exploitation is possible with CVE-2026-49869?
CVE-2026-49869 allows attackers to execute arbitrary code remotely due to authentication bypass in the AuthenticationFilter.