Detections
Analytics
Langflow auto_login + validate/code Chain Unauthenticated RCE (CVE-2026-9198) (Direct Check)
critical Nessus Plugin ID 334529
Language:
Synopsis
The remote host is running a web application affected by multiple vulnerabilities that can be chained for unauthenticated remote code execution.Description
The version of Langflow running on the remote host is affected by two vulnerabilities that can be chained to achieve unauthenticated remote code execution:- CVE-2026-9103: The '/api/v1/auto_login' endpoint mints a superuser JWT bearer token to any unauthenticated caller when the default AUTO_LOGIN configuration is enabled.
- CVE-2026-8481: The '/api/v1/validate/code' endpoint compiles and evaluates attacker-supplied Python during 'validation' using an unsandboxed exec() whose globals expose importlib and Python builtins. Function default-argument values and decorators are executed at definition time.
A remote, unauthenticated attacker can chain these flaws by first requesting a superuser token from the auto_login endpoint, then submitting crafted Python code to validate/code whose default argument executes arbitrary Python, and ultimately arbitrary operating system commands, as the Langflow service user.
Nessus confirmed the chain non-destructively by obtaining a token from /auto_login and coercing the target into performing an out-of-band callback (a DNS lookup and/or a direct socket connection) back to the Nessus scanner. No operating system commands were executed on the target.
Solution
Upgrade to Langflow version 1.10.1 or later.See Also
Plugin Details
Severity: Critical
ID: 334529
File Name: langflow_auto_login_validate_code_rce_cve_2026_9198.nbin
Version: 1.3
Type: Remote
Family: Artificial Intelligence
Published: 8/11/2026
Updated: 8/24/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: High
Score: 8.9
Percentile: 99.7
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 8.3
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-9198
CVSS v3
Risk Factor: Critical
Base Score: 9.9
Temporal Score: 9.2
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C
CVSS Score Source: CVE-2026-8481
Vulnerability Information
CPE: cpe:/a:langflow:langflow
Required KB Items: installed_sw/Langflow
Exploit Available: true
Exploit Ease: Exploits are available
Exploited by Nessus: true
Patch Publication Date: 7/29/2026
Vulnerability Publication Date: 7/17/2026
CISA Known Exploited Vulnerability Due Dates: 8/7/2026
Exploitable With
Metasploit (Langflow AI auto_login RCE)