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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsKestra’s CVE-2026-49869 is a critical authentication bypass in Kestra OSS: a suffix check intended to exempt public configuration routes could also exempt unrelated API paths ending in /configs. Kestra says an unauthenticated attacker could use the flaw to create and execute workflows, potentially achieving remote code execution inside the Kestra worker container. The vendor lists Kestra 1.0.45 and 1.3.21 as fixed; affected operators should verify their release branch and upgrade to a vendor-fixed version.
What went wrong in Kestra?
Kestra OSS’s AuthenticationFilter used request.getPath().endsWith("/configs") in the Basic Auth exception for public configuration endpoints. The exception was meant for routes such as GET /api/v1/configs and tenant-scoped configuration paths. Because the check considered only how a path ended—not whether it was the intended route—unrelated API resources whose final path component was configs could also bypass authentication. Kestra describes the problem in its security advisory.
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This is a route-matching failure with an authorization consequence. A path that resembles the end of a public route is not proof that the request targets that route. As a general design lesson, exceptions should match the intended route precisely and account for the request method and route structure.
What could an unauthenticated attacker do?
Kestra says a remote attacker without credentials could create and execute arbitrary workflows. The advisory identifies default-enabled script plugins, including shell and Python, as a path to operating-system command execution, and describes the resulting remote code execution as occurring as root inside the Kestra worker Docker container. That is a claim about the worker container; it should not be read as proof of root access on the host.
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The advisory also lists possible server-side request forgery (SSRF), unauthorized create, read, update, and delete operations on resources named configs, potential cloud-credential theft through metadata access, and audit-log deletion. These are impacts described by the vendor, not evidence that a particular deployment was compromised. Kestra notes that the worker container lacks CAP_SYS_ADMIN and has no mounted Docker socket; it says a direct escape through a Docker socket was not confirmed.
Which Kestra versions are affected, and what is fixed?
Kestra’s GitHub advisory gives the affected range as versions through 1.3.20 and lists 1.0.45 and 1.3.21 as patched releases. Check Point’s advisory describes the version boundary differently, particularly for 1.0.x. Since Kestra explicitly lists 1.0.45 as fixed, do not infer that it is vulnerable from Check Point’s shorthand; confirm the precise release and branch against Kestra’s vendor guidance.
| Version information | What the advisories say |
|---|---|
| Through 1.3.20 | Listed as affected by Kestra’s advisory. |
| 1.0.45 | Listed as patched by Kestra; Check Point’s shorthand boundary differs, so verify the applicable branch with Kestra. |
| 1.3.21 | Listed as patched by Kestra. |
How should operators respond?
- Identify the running version. Inventory each Kestra deployment and determine its release branch; do not rely on a repository version, image tag, or planned upgrade as evidence of what is running.
- Upgrade to a vendor-fixed release. Apply the fixed version appropriate to that branch, following Kestra’s current release guidance. Verify the deployed version after rollout.
- Reduce exposure while upgrading. If an immediate upgrade is not possible, restrict network access to the Kestra service to trusted systems. This is a temporary risk-reduction measure, not a correction to the vulnerable authentication logic.
- Review activity for signs of misuse. As a prudent response, inspect authentication records and workflow activity for unexpected access or workflow creation and execution. The advisory’s impact list is not proof of compromise, so investigate evidence in the affected deployment.
What does the severity rating tell you?
Kestra rates CVE-2026-49869 Critical, with a CVSS 3.1 base score of 10.0 and vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. The vector describes a network-reachable issue requiring low complexity, no privileges, and no user interaction, with high potential impact to confidentiality, integrity, and availability across a changed security scope. The score conveys severity; it does not establish that a particular instance is exposed or has been attacked.
Can an IPS replace upgrading?
No. Check Point says its Security Gateway IPS can detect exploit attempts when the latest IPS update is installed, and its advisory provides instructions for enabling and updating that protection. That may add a defensive layer for organizations already using the product, but it does not fix Kestra’s vulnerable code. Treat patching as the remediation and IPS coverage as supplementary.
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