Detections
Analytics

Langflow < 1.9.0 Missing Authorization (CVE-2026-33760)

high Nessus Plugin ID 326242

Synopsis

The remote host is affected by a missing authorization vulnerability.

Description

The version of Langflow installed on the remote host is prior to 1.9.0. It is, therefore, affected by a missing authorization vulnerability:

 - The /api/v1/monitor router exposes 7 endpoints that perform read, write, and delete operations on user-owned resources without verifying that the authenticated requester owns the targeted resource. Any authenticated user can read, modify, rename, or permanently delete another user's messages, sessions, build artifacts, and LLM transaction logs by supplying the target's resource ID or flow_id. (CVE-2026-33760)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Langflow version 1.9.0 or later.

See Also

http://www.nessus.org/u?cd9562d3

Plugin Details

Severity: High

ID: 326242

File Name: langflow_CVE-2026-33760.nasl

Version: 1.1

Type: Combined

Agent: windows, macosx, unix

Published: 7/10/2026

Updated: 7/10/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.01

CVSS v2

Risk Factor: High

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-33760

CVSS v3

Risk Factor: High

Base Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:langflow:langflow

Required KB Items: installed_sw/Langflow

Patch Publication Date: 4/14/2026

Vulnerability Publication Date: 6/11/2026

Reference Information

CVE: CVE-2026-33760