Vulnerability · Published Jun 26, 2026 · Assigned by GitHub_M

CVE-2026-53577Kestra: Cross-Execution File Read via Preview Endpoint (IDOR)

Medium 6.5

In plain English

A medium-severity incorrect authorization in kestra from kestra-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 61.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
kestra-io	kestra	< 1.0.45>= 1.1.0, < 1.3.21

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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