CVE-2026-53577
Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)
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.
INFO
Published Date :
June 26, 2026, 10:16 p.m.
Last Modified :
July 1, 2026, 12:38 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Kestra to version 1.0.45 or later.
- Update Kestra to version 1.3.21 or later.
- Ensure proper access controls are enforced for all endpoints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53577.
| URL | Resource |
|---|---|
| https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42 | Exploit Mitigation Vendor Advisory |
| https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42 | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53577 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53577
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53577 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53577 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 01, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.45 *cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:* versions from (including) 1.1.0 up to (excluding) 1.3.21 Added Reference Type GitHub, Inc.: https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42 Types: Exploit, Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42 Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42 Added SSVC {'id': 'CVE-2026-53577', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-27T03:15:19.214267Z'} -
New CVE Received by [email protected]
Jun. 26, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'kestra-io', 'product': 'kestra', 'versions': [{'status': 'affected', 'version': '< 1.0.45'}, {'status': 'affected', 'version': '>= 1.1.0, < 1.3.21'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-863 Added Reference https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42