CVE-2026-49869: kestra kestra

CVSS 10.0 (critical) · listed as exploited by CISA since 2026-09-02 · published 2026-06-26

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 (NVD): kestra kestra

Fixed in (NVD): 1.0.45, 1.3.21

Weakness: CWE-78, CWE-184, CWE-287, CWE-918

Source: NVD CVE-2026-49869

References

• https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx
• https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-49869

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.