Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`

Summary

CVE	CVE-2026-49869
State	PUBLISHED
Assigner	GitHub_M
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-06-26 22:16:32 UTC
Updated	2026-09-03 13:05:55 UTC
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.

Primary CVSS: v3.1 10 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.019170000 probability, percentile 0.785260000 (date 2026-09-08)

CISA KEV: Listed on 2026-09-02; due 2026-09-05; ransomware use Unknown

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	10	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
3.1	CNA	DECLARED	10	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Vendor	Kestra
Product	Kestra OSS
Name	Kestra OSS OS Command Injection Vulnerability
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.
Notes	This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-49869

Type	Vendor	Product	Version	Update	Edition	Language
Application	Kestra	Kestra	All	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Kestra-io	Kestra	affected < 1.0.45	Not specified
CNA	Kestra-io	Kestra	affected >= 1.1.0, < 1.3.21	Not specified

Reference	Source	Link	Tags
github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx	134c704f-9b21-4f2e-91b3-4a467353bcc0	github.com	Exploit, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog	134c704f-9b21-4f2e-91b3-4a467353bcc0	www.cisa.gov	US Government Resource
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis
CISA Known Exploited Vulnerabilities catalog	CISA	www.cisa.gov	kev

No vendor comments have been submitted for this CVE.

Source	Time	Event
ADP	2026-09-02T00:00:00.000Z	CVE-2026-49869 added to CISA KEV

There are currently no legacy QID mappings associated with this CVE.