What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-09-02
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-26 · updated 2026-10-25
• Weakness: CWE-78

Description

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-io kestra: before 1.0.45; from 1.1.0 before 1.3.21 — fixed in 1.0.45, 1.3.21

How to fix

Upgrade to a fixed version: kestra-io kestra 1.0.45, 1.3.21. Check the vendor advisory for mitigations.

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

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