# CVE-2026-49869: Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`

> CVE-2026-49869: Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`. CVSS 10.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-49869
Last updated: 2026-10-25T17:10:00Z

- Published: 2026-06-26 20:58 UTC · Updated: 2026-10-25 17:10 UTC · Assigner: GitHub\_M
- CVSS: 10.0 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS: 2.1%, 82th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-09-02, federal due date 2026-09-05, ransomware use: Unknown
- CWE: CWE-184, CWE-287, CWE-78, CWE-918

## 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.

## CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

## Affected vendors and products

- kestra-io: kestra

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-49869)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-49869)
- [https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx](https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-49869 · Markdown: https://rewindex.com/cve/CVE-2026-49869.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-49869 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:31.935Z