# 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.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2026
- **Updated:** 27 Jun 2026
- **Also known as:** GHSA-r6v3-xxwj-9h42

## 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 (Incorrect Authorization)

## Which versions are affected by CVE-2026-53577?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2026-49869/): Kestra OSS OS Command Injection (critical 10.0, exploited in the wild)
- [CVE-2026-53576](https://insights.sbomify.com/CVE-2026-53576/): Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass (critical 10.0)
- [CVE-2026-34612](https://insights.sbomify.com/CVE-2026-34612/): Kestra: Remote Code Execution via SQL Injection (critical 10.0)
- [CVE-2026-38428](https://insights.sbomify.com/CVE-2026-38428/): SQL injection in n/a (critical 9.8)
- [CVE-2026-55069](https://insights.sbomify.com/CVE-2026-55069/): Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53577 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53577 exists.

Affected product: kestra-io kestra. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53577/ (Markdown: https://insights.sbomify.com/CVE-2026-53577/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53577
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53577
- OSV: https://osv.dev/vulnerability/CVE-2026-53577

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-53577/
Summaries are generated and may contain mistakes; the official description above is the record.