All vulnerabilities
CVE-2026-55423GHSA-7hw8-6q6r-4276PYSEC-2026-222

Langflow: Logout button does not clear session

langflow-ai langflowpipApplications & CMS
Open in ThreatlineRecord JSON
CVSS
6.1Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 23 Jun 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.22%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.7.0Fixed versionGitHub
Published23 Jun 2026Updated 24 Sep 2026CVE List

What fixes it

  • 1.7.0langflow, pipGitHub
  • 1.7.0langflow, PyPIOSVpip install "langflow>=1.7.0"

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from GitHub Advisory Database

Affected versions 53

  • langflow, pip< 1.7.0GitHub
  • langflowaffected: < 1.7.0CVE List
  • langflow, PyPIfrom first release, fixed in 1.7.0OSV
  • langflow, PyPI0.0.31OSV
  • langflow, PyPI0.0.32OSV
  • langflow, PyPI0.0.33OSV
  • langflow, PyPI0.0.40OSV
  • langflow, PyPI0.0.44OSV
  • langflow, PyPI0.0.45OSV
  • langflow, PyPI0.0.46OSV
  • langflow, PyPI0.0.52OSV
  • langflow, PyPI0.0.53OSV
  • langflow, PyPI0.0.54OSV
  • langflow, PyPI0.0.55OSV
  • langflow, PyPI0.0.56OSV
  • langflow, PyPI0.0.57OSV
  • langflow, PyPI0.0.58OSV
  • langflow, PyPI0.0.61OSV
  • langflow, PyPI0.0.62OSV
  • langflow, PyPI0.0.63OSV
  • langflow, PyPI0.0.64OSV
  • langflow, PyPI0.0.65OSV
  • langflow, PyPI0.0.66OSV
  • langflow, PyPI0.0.67OSV
  • langflow, PyPI0.0.68OSV
  • langflow, PyPI0.0.69OSV
  • langflow, PyPI0.0.70OSV
  • langflow, PyPI0.0.71OSV
  • langflow, PyPI0.0.72OSV
  • langflow, PyPI0.0.73OSV
  • langflow, PyPI0.0.74OSV
  • langflow, PyPI0.0.75OSV
  • langflow, PyPI0.0.76OSV
  • langflow, PyPI0.0.78OSV
  • langflow, PyPI0.0.79OSV
  • langflow, PyPI0.0.80OSV
  • langflow, PyPI0.0.81OSV
  • langflow, PyPI0.0.83OSV
  • langflow, PyPI0.0.84OSV
  • langflow, PyPI0.0.85OSV
  • langflow, PyPI0.0.86OSV
  • langflow, PyPI0.0.87OSV
  • langflow, PyPI0.0.88OSV
  • langflow, PyPI0.0.89OSV
  • langflow, PyPI0.1.0OSV
  • langflow, PyPI0.1.2OSV
  • langflow, PyPI0.1.3OSV
  • langflow, PyPI0.1.4OSV
  • langflow, PyPI0.1.5OSV
  • langflow, PyPI0.1.6OSV
  • langflow, PyPI0.1.7OSV
  • langflow, PyPI0.2.0OSV
  • langflow, PyPI0.2.1OSV

References 6