Critical severity · published Jun 26, 2026
CVE-2026-49869
Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`
In wildKEV
10.0
CVSS
2.1%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 82% of CVEs
Exploited in the wildYes
CISA KEVListed Sep 2, 2026
Federal remediation dueSep 5, 2026
Ransomware campaign useNot known
Affected products
Which versions
KE
kestra · kestra-io
< 1.0.45; >= 1.1.0, < 1.3.21 · source: vendor, NVD
KO
Kestra OSS · Kestra
All versions, or not specified · source: KEV
In the news
AdvisoryHigh
CISA Adds Seven Known Exploited Vulnerabilities to Catalog
CISA has added seven new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.
CVE-2026-9586 Sangoma Switchvox SQL Injection Vulnerability
CVE-2026-48710 Kludex Starlette HTTP Request/Response Smuggling Vulnerability
CVE-2026-49869 Kestra OSS OS Command Injection Vulnerability
CVE-2026-59822 BerriAI LiteLLM Improper Authentication Vulnerability
CVE-2026-82329 JFrog Artifactory Improper Authentication Vulnerability
CVE-2026-83548 SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
CVE-2026-83549 SonicWall SMA1000 Appliances OS Command Injection Vulnerability
These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise.
Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action f...
Sep 2, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2026-49869: Kestra Kestra OSS - Kestra OSS OS Command Injection Vulnerability
Kestra OSS contains an OS command injection vulnerability that could allow an unauthenticated remote attacker to create and execute arbitrary workflows without credentials.
KOKestra OSSCVE-2026-49869
Sep 2, 2026·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49869
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49869
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_CONFIRM
https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx
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