CVE-2026-63407: Getgrav Grav-Plugin-API

High severity, CVSS 8.2. EPSS: 0.4% chance of exploitation in the next 30 days.

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin CorsMiddleware returns Access-Control-Allow-Origin: * and permissive OPTIONS responses for authenticated /api/v1 endpoints. JavaScript from any origin can submit an attacker-obtained JWT through the Authorization or X-API-Token header, read the authenticated response, and perform write operations with the token owner's privileges, enabling data exfiltration and account modification. This issue is fixed in version 1.0.0-rc.16.

Affected products

• Getgrav Grav-Plugin-API: before 1.0.0-rc.16 (fixed in 1.0.0-rc.16)

Published 2026-08-19. Last modified 2026-09-09.