CVE-2026-5026: Langflow

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content. Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.

Affected products

• Langflow Langflow: affected versions not specified

Published 2026-03-27. Last modified 2026-06-17.