CVE-2026-55423 — Langflow: Logout button does not clear session

Affected: langflow-ai langflow

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.7.0, the logout button does not clear the session. The previous user stays logged in unless another user explicitly logs in. This vulnerability is fixed in 1.7.0.

GHSA-7hw8-6q6r-4276 — Langflow: Logout button does not clear session

Affected: PyPI: langflow

### 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**.

Most recent entries from all

CVE-2026-55423 — Langflow: Logout button does not clear session

GHSA-7hw8-6q6r-4276 — Langflow: Logout button does not clear session