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CVE-2026-53577— Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)

Quick assessment

Affected
kestra-io kestra
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

kestra是Kestra公司开源的一个工作流自动化平台。 kestra-io kestra存在授权问题漏洞，该漏洞源于previewFileFromExecution端点存在访问控制绕过，可能导致任何经过身份验证的用户读取同一租户内其他执行的输出文件。

CVSS 6.5 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
kestra-io kestra < 1.0.45 affected
>= 1.1.0, < 1.3.21 affected
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I. Basic Information for CVE-2026-53577

Vulnerability Information
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Vulnerability Title
Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)
Source: CVE Program / CVE List V5
Vulnerability Description
Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the previewFileFromExecution endpoint (GET /api/v1/{tenant}/executions/{executionId}/file/preview) contains an access control bypass that allows any authenticated user to read output files from any other execution within the same tenant, bypassing execution-level and namespace-level isolation. This vulnerability is fixed in 1.0.45 and 1.3.21.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
kestra-io kestra 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kestra是Kestra公司开源的一个工作流自动化平台。 kestra-io kestra存在授权问题漏洞，该漏洞源于previewFileFromExecution端点存在访问控制绕过，可能导致任何经过身份验证的用户读取同一租户内其他执行的输出文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kestra-io kestra < 1.0.45 -

II. Public POCs for CVE-2026-53577

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III. Intelligence Information for CVE-2026-53577

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Vendor Advisories for CVE-2026-53577 (1)

Same Patch Batch · kestra-io · 2026-06-26 · 6 CVEs total

CVE-2026-53576 10.0 CRITICAL Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass
CVE-2026-49869 10.0 CRITICAL Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `Authentication
CVE-2026-55069 8.7 HIGH Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack
CVE-2026-45807 7.7 HIGH Kestra: Path traversal via URL-encoded "%2E%2E" in execution and namespace file endpoints
CVE-2026-49984 7.7 HIGH Kestra: Path traversal in `LocalStorage` allows any authenticated user to read arbitrary s

IV. Related Vulnerabilities

Same product: kestra
Same vendor: kestra-io
Same weakness: CWE-863

V. Comments for CVE-2026-53577

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