CVE-2026-53577 Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)
Authenticated users can read output files from other executions in the same tenant due to missing access controls on the preview endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53577?
CVE-2026-53577 is a medium-severity missing authorization vulnerability in kestra-io kestra, published on 26 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-53577?
It affects 1 product.
Products include Kestra Kestra.
How do I fix CVE-2026-53577?
No fix has been published for CVE-2026-53577 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53577 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53577 exists.
Other vulnerabilities in kestra-io kestra
- CVE-2026-49869 Kestra OSS OS Command Injection
- CVE-2026-53576 Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass
- CVE-2026-34612 Kestra: Remote Code Execution via SQL Injection
- CVE-2026-38428 SQL injection in n/a
- CVE-2026-55069 Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack
Sources
Also known as GHSA-r6v3-xxwj-9h42.