CVE-2026-53576Public exploitNetwork attack vector

Unauthenticated RCE via path-suffix authentication bypass

Published Jun 26, 2026 · Updated Jun 26, 2026

Authentication bypass in Kestra before 1.0.45 and 1.1.0 through 1.3.20 allows remote attackers to execute arbitrary code. AuthenticationFilter classifies any REST API path ending in /configs as the public configuration endpoint and skips Basic Auth before route resolution. A network-reachable, initialized OSS server then accepts anonymous flow creation and execution, yielding root code execution in the container and host control when the Docker socket is mounted.

CVSS severity10.0
Critical
EPSS probability3.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Kestra before 1.0.45 and 1.1.0 through 1.3.20 allows remote attackers to execute arbitrary code. AuthenticationFilter classifies any REST API path ending in /configs as the public configuration endpoint and skips Basic Auth before route resolution. A network-reachable, initialized OSS server then accepts anonymous flow creation and execution, yielding root code execution in the container and host control when the Docker socket is mounted.

The record

CVE
CVE-2026-53576
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Kestra
Product
Kestra
Classifications
CWE-288, CWE-94, T1190, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.45
  2. Affected versionversion=>= 1.1.0, < 1.3.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kestra · Kestraversion=< 1.0.45; version=>= 1.1.0, < 1.3.21

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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