Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter` (CVE-2026-49869) | HOL Guard CVE

Critical · CVSS 10.0CVE-2026-49869

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

Answer in brief

CVE-2026-49869 records a Critical severity (CVSS 10.0) vulnerability in Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`. The current sources do not mark it as known exploited. The current feed maps kestra-io/kestra (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 26, 2026Updated Sep 2, 2026Source checked Sep 2, 2026First seen by HOL Jun 26, 2026Material review Sep 2, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 10.0
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 10.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps kestra-io/kestra (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
kestra-io/kestrageneric	< 1.0.45 \|\| >= 1.1.0, < 1.3.21	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for kestra-io/kestra.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 26, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.