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TI-2026-36817 Aliases CVE-2026-49984

Information disclosure in kestra

Priority HIGH 67CWE-180Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.23, the local internal-storage backend validates user-supplied paths for .. traversal before it converts Windows-style backslashes to forward slashes. An attacker can therefore smuggle a traversal sequence past the guard using backslashes (..\..\..\); the guard sees a harmless string, and the path is only rewritten to ../../../ after validation, immediately before the file is opened. Any authenticated user who can view an execution (the lowest-privilege role) can call GET /api/v1/{tenant}/executions/{executionId}/file?path=… and read any file on the server filesystem readable by the Kestra process, outside the storage sandbox and across every tenant and namespace. This includes the embedded H2 database (all flows, all users, all stored secrets), internal storage of every other tenant/namespace, mounted secret files, and the process environment (/proc/self/environ) which contains configured database and secret-backend credentials. It is a complete breach of Kestra's storage isolation and multi-tenancy boundary. This vulnerability is fixed in 1.0.45 and 1.3.23.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00567 47th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed kestra (kestra-io): 1.0.45, 1.3.23

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Kestrakestrabefore 1.0.45; 1.1.0 to before 1.3.231.0.45, 1.3.23Patch availableCNA
  • kestra VendorKestra Affected before 1.0.45; 1.1.0 to before 1.3.23 Fixed in 1.0.45, 1.3.23 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*before 1.0.45; 1.1.0 to before 1.3.23VulnerableKestra
  • cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:* Versions before 1.0.45; 1.1.0 to before 1.3.23 Vulnerable ·Kestra

Remediation

  • Fix · CNA kestra (kestra-io) Fixed in 1.0.45, 1.3.23

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49984

References

Exploit 1

  • TI-2026-36769 Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter` KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-38637 Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass CVSS 3.1CRITICAL 10.0
  • TI-2026-28138 Kestra v1.3.3 and before is vulnerable to SQL Injection. CVSS 3.1CRITICAL 9.8
  • TI-2026-26858 Kestra: Remote Code Execution via SQL Injection CVSS 3.1CRITICAL 10.0
  • TI-2026-39775 Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack CVSS 3.1HIGH 8.7
  • TI-2026-33542 Kestra: Path traversal via URL-encoded "%2E%2E" in execution and namespace file endpoints allows arbitrary file read CVSS 3.1HIGH 7.7
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences