Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter` (kestra-io kestra)
At a glance
- Source
- NVD
- EPSS
- EPSS 2.10 % · percentile 82 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-78 — Improper Neutralization of Special Elements used in an OS Command
- CWE-184 — Incomplete List of Disallowed Inputs
- CWE-287 — Improper Authentication
- CWE-918 — Server-Side Request Forgery
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | CRITICAL 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-39922
- GCVE · GCVE-0-2026-49869
Affected configurations (NVD CPE)
cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*< 1.0.45cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*≥ 1.1.0 < 1.3.21
Affected products
| Product | Versions |
|---|---|
| kestra-io · kestra | affected < 1.0.45 ; affected >= 1.1.0, < 1.3.21 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |