CVE-2026-49869: Kestra OSS

What is CVE-2026-49869?

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.

CVSS10 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS2% · P81

Triage statusActive Exploit

ActionPatch immediately

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

CWECWE-78

NVD published2026-06-26

NVD last modified2026-09-03

Timeline

2026-06-26Published to the U.S. National Vulnerability Database (NVD)
2026-09-02Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-03NVD record last updated
2026-09-04First covered in a defend.network daily briefing
2026-09-05CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

Kestra OSS OS Command Injection Vulnerability

Added to KEV2026-09-02

Federal patch deadline2026-09-05

Known ransomware useUnknown

Affected product

Kestra OSS

Remediation Steps

Apply the vendor security update for Kestra OSS as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
Critical RCEs in Cisco Nexus, HPE ArubaOS; infrastructure compromises escalate (2026-09-04)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.