Missing Authorization in Langflow - CVE-2026-34046
Published: April 24, 2026
Vulnerability identifier: #VU127538
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34046
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to read, modify, and delete arbitrary flows.
The vulnerability exists due to missing authorization in GET/PATCH/DELETE /api/v1/flow/{flow_id} via the _read_flow helper when handling requests for flow IDs while authentication is enabled. A remote user can send a request for another user's flow UUID to read, modify, and delete arbitrary flows.
Exposed flow data may include embedded plaintext API keys.
Affected software
Langflow
How to mitigate CVE-2026-34046
Install security update from vendor's website.
Langflow - addressed in versions 0.5.1, 1.5.1