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CVE-2026-49869

Kestra OSS OS Command Injection

10.0 CRITICALActively exploited (CISA KEV)Public exploitEPSS 2.10%
  1. Published26 Jun 2026
  2. Added to CISA KEV2 Sept 2026
  3. Remediation due5 Sept 2026
Actively exploited (CISA KEV)

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

Added to KEV: 2 Sept 2026Federal remediation due: 5 Sept 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Kestra≥ 1.1.0 < 1.3.21 · < 1.0.45

Remediation

Fixed in
Kestra≥ 1.3.21

References

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Frequently asked

Is CVE-2026-49869 being actively exploited?

Yes. CVE-2026-49869 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2 Sept 2026.

How severe is CVE-2026-49869?

CVE-2026-49869 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 2.10% probability of exploitation.

Which products are affected by CVE-2026-49869?

Affected products include Kestra.

How do I fix CVE-2026-49869?

Upgrade affected software to a fixed version, for example Kestra 1.3.21 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-49869 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.