Medium severity · published Jun 26, 2026
CVE-2026-53577
Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
kestra · kestra-io
< 1.0.45; >= 1.1.0, < 1.3.21 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53577
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53577
Exploit
https://github.com/kestra-io/kestra/security/advisories/GHSA-r6v3-xxwj-9h42
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