CVE-2026-42608

The Grav CMS file-based web platform is vulnerable to an unauthenticated Path Traversal vulnerability in its FormFlash core component (specifically within the __construct() / getTmpDir() methods). By manipulating the session_id parameter (passed as __form-flash-id in POST requests), an attacker c...

CVE-2026-42608 Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component.

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traversal vulnerability within the FormFlash core component. By manipulating the sessionid passed as form-flash-id in POST requests, an unauthenticated attacker can traverse the filesystem to create arbitrary directories an...

Grav path traversal vulnerability

Grav is a scalable content management system CMS developed by the Grav open-source community, suitable for use in personal blogs, small content publishing platforms, and single-page product displays. Versions of Grav prior to 2.0.0-beta.2 contained a path traversal vulnerability. This vulnerabili...