CVE-2026-53577

Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)

MEDIUM

6.5

CVSS Score

Published: June 26, 2026 at 08:52 PM UTC

Updated: October 25, 2026 at 05:10 PM UTC

2 products affected across 2 vendorsKestraKestra

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kestra · Kestra

95%

v < 1.0.451.1.0 ≤ v < 1.3.21

Affected range stops below 1.0.45, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.21, so it looks safe — our inference, not a vendor statement

Kestra · Kestra Io

90%

v < 1.0.45

Affected range stops below 1.0.45, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.21, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42

References (1)

x_refsource_CONFIRMExploitMitigationVendor Advisory

Source: cverecord

https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-863

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