Insufficient Session Expiration in Langflow - CVE-2026-55423
Published: June 19, 2026
Vulnerability identifier: #VU134970
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55423
CWE-ID: CWE-613
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Langflow
Affected software:
Langflow
Langflow
Detailed vulnerability description
The vulnerability allows an attacker with physical access to gain unauthorized access to a previous user's session.
The vulnerability exists due to insufficient session expiration in the logout endpoint and frontend logout functionality when processing logout requests. An attacker with physical access can use a shared system after logout and refresh the application to gain unauthorized access to a previous user's session.
The issue occurs when auto login mode is disabled and the application is hosted on localhost. Authentication tokens remain present in local storage and cookies after logout.
How to mitigate CVE-2026-55423
Install security update from vendor's website.