CVE-2026-49869: Kestra OSS OS Command Injection Vulnerability

Critical severity, CVSS 10.0. Actively exploited: in CISA KEV since 2026-09-02. EPSS: 2.1% chance of exploitation in the next 30 days.

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 products

• Kestra Kestra: before 1.0.45 (fixed in 1.0.45); from 1.1.0, before 1.3.21 (fixed in 1.3.21)

Published 2026-06-26. Last modified 2026-09-03.