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

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.

CISA KEV SSVC: Active Exploitation Automatable Authentication Bypass
CVSS Base Score
10.0
CRITICAL
Exploitability:3.9
Impact Score:6.1
Temporal Score:-
EPSS:0.99%

Threat Intelligence Signals

CISA KEV
YES
KEV Date Added
2026-09-02
Ransomware Use
Unknown
KEV Due Date
2026-09-05
VulnCheck In-the-Wild
No
Nuclei Template
No
EPSS Score
0.991%
EPSS Percentile
60.2th pct
GHSA ID
GitHub Severity
SSVC Exploitation
Active
SSVC Automatable
Yes
Vulnerability Class
Authentication Bypass

Identity & Timeline

Status-
Assigning Authority-
Discovered Via-
Record Completeness-
CVSS Version / Source-
Reserved-
Published-
Patch Date (date_public)-
Exploit DB Date-
First GitHub PoC Date-
Last Updated-
Time to Patch (Days to fix)-
Exploit Release Gap-
PoC Release Gap-
Exploit DB ReferencesNone identified

Affected Products & Versions

Vendor Product Affected Versions
No affected products specified.

References

No reference links found.

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