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Medium

Langflow: Logout button does not clear session

  • Disclosed: 19.06.2026
  • Updated: 11.10.2026 15:18

Summary

The logout button does not clear the session. The previous user stays logged in unless another user explicitly logs in.

Details

Not in auto login mode. Hosted on localhost. access_token_lf remains present in both Local Storage and Cookies. refresh_token_lf remains present in Cookies.

Root cause: the /logout endpoint deleted the authentication cookies without matching the original httponly/samesite/secure/domain parameters, so the browser kept them; additionally the frontend did not clear the auth cookies on logout.

LANGFLOW_AUTO_LOGIN: "False"
LANGFLOW_SUPERUSER: <set>
LANGFLOW_SUPERUSER_PASSWORD: <set>
LANGFLOW_SECRET_KEY: <set>
LANGFLOW_NEW_USER_IS_ACTIVE: "False"
LANGFLOW_ENABLE_SUPERUSER_CLI: "False"

PoC

Click Logout. Hit refresh to return to previous screen.

Impact

Users on shared computers may falsely believe they have terminated their session.

Patches

Fixed in 1.7.0 (PRs #10527 and #10528). The logout endpoint now deletes the auth cookies using the same parameters they were created with, and the frontend clears the auth cookies on logout. Upgrade to 1.7.0 or later.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) langflow < 1.7.0 1.7.0

References

CVSS score 6.1/10
CVSS vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE)
CWE-613
Platform
Python (PyPI)
Package
langflow
Disclosed
19.06.2026
Updated
11.10.2026 15:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-222 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-7hw8-6q6r-4276 - CC BY 4.0

Vulnerability history: langflow

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (42) in the archive
Total entries
42
First → latest
06.2024 10.2026
Without a fix
7
Exploited in attacks
5

Severity breakdown

  • Critical 15
  • High 17
  • Medium 7
  • Low 3

Disclosures per year

Severity:
  1. Langflow: OS command injection (RCE) via arbitrary command in MCP stdio server configuration
    Critical · 9.9 CVE-2026-105697 >= 1.1.2, < 1.10.3 1.10.3
  2. Langflow has Authenticated Cross-Project File Disclosure via Unscoped MCP Resource Handlers
    High CVE-2026-105699 >= 1.6.8, < 1.9.1 1.9.1
  3. Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write
    High · 7.1 CVE-2026-105741 >= 1.5.0, < 1.10.3 1.10.3
  4. Langflow: PythonREPLComponent executes unsandboxed Python code, enabling authenticated RCE and privilege escalation
    Critical · 9.9 CVE-2026-10561 < 1.10.1 1.10.1
  5. Langflow: Weak Fernet Key via random.seed()
    Critical · 9.1 CVE-2026-9205 < 1.10.1 1.10.1
  6. Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
    Critical · 9.8 CVE-2026-8505 >= 1.7.0, < 1.9.1 1.9.1
  7. Langflow: Title Authenticated Remote Code Execution in validate_code via Malicious Decorators Description
    High · 8.8 CVE-2026-51886 >= 1.7.2, < 1.10.1 1.10.1
  8. Langflow: Prompt injection in Langflow Smart Transform can lead to code execution
    High · 8.8 CVE-2026-7700 >= 1.3.0, < 1.10.3 1.10.3
  9. Langflow: BaseFileComponent-based nodes arbitrary file read with RCE exploit
    Critical · 9.6 CVE-2026-55447 < 1.9.2 1.9.2
  10. Langflow: Unauthenticated DoS through multipart form boundary file upload
    High · 7.5 CVE-2026-55446 < 1.0.19 1.0.19
  11. Langflow: Logout button does not clear session this entry
    Medium · 6.1 CVE-2026-55423 < 1.7.0 1.7.0
  12. Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow
    High · 8.4 Exploited in attacks CVE-2026-55255 < 1.9.1 1.9.1
  13. Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
    Critical · 9.3 CVE-2026-55450 < 1.9.1 1.9.1
  14. Langflow: Unauthenticated RCE in Shareable Playgrounds
    Critical · 9.6 CVE-2026-48519 < 1.9.2 1.9.2
  15. Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints
    High · 8.8 CVE-2026-33760 < 1.9.0 1.9.0
  16. Langflow Knowledge Bases API is Vulnerable to Path Traversal
    Critical · 9.6 CVE-2026-42048 < 1.9.0 1.9.0
  17. Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership Check
    High CVE-2026-34046 < 1.5.1 1.5.1
  18. Langflow has Authenticated Code Execution in Agentic Assistant Validation
    Critical CVE-2026-33873 < 1.9.0 1.9.0
  19. langflow: /profile_pictures/{folder_name}/{file_name} endpoint file reading
    High CVE-2026-33497 < 1.7.1 1.7.1
  20. langflow has Unauthenticated IDOR on Image Downloads
    High · 7.5 CVE-2026-33484 >= 1.0.0, < 1.9.0 1.9.0
Show more (13) Showing 20 of 33

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