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

CISA Known Exploited Vulnerabilities

Name

Kestra OSS OS Command Injection Vulnerability

Vendor

Kestra

Product

Kestra OSS

Added to the catalog

2026-09-02

Due date for US federal agencies

2026-09-05

Weaknesses

CWE-78, CWE-184, CWE-287, CWE-918

Catalog version

2026.10.30

Kestra OSS contains an OS command injection vulnerability that could allow an unauthenticated remote attacker to create and execute arbitrary workflows without credentials.

Required action (CISA)

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.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx
• https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
• 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

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2026-06-26T22:16:32.113

Last modified

2026-10-25T17:10:00.197

Weaknesses

CWE-78, CWE-184, CWE-287, CWE-918

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.

References

• https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx (Exploit, Vendor Advisory)
• https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx (Exploit, Vendor Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-49869 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:31.494Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-49869

CVE record

Title (CNA)

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

Assigner

GitHub_M

State

PUBLISHED

Published

2026-06-26T20:58:19.576Z

Updated

2026-09-03T03:55:27.114Z

Problem types

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'); CWE-184: Incomplete List of Disallowed Inputs; CWE-287: Improper Authentication; CWE-918: Server-Side Request Forgery (SSRF)

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.

References

• https://github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx

Read on 2026-11-03T02:20:25.577Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/49xxx/CVE-2026-49869.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/