Authorization bypass through user-controlled key in Langflow - CVE-2026-33484
Published: April 24, 2026
Vulnerability identifier: #VU127534
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33484
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Langflow
Affected software:
Langflow
Langflow
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to missing authorization in the /api/v1/files/images/{flow_id}/{file_name} endpoint when handling image download requests. A remote attacker can send a crafted request with a known or guessed flow_id and file_name to disclose sensitive information.
In multi-tenant deployments, the issue can expose images uploaded by other users.
How to mitigate CVE-2026-33484
Install security update from vendor's website.