Vulnerability Description
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 session_id (passed as __form-flash-id in POST requests), an unauthenticated attacker can traverse the filesystem to create arbitrary directories and write an index.yaml file containing attacker-controlled data. This vulnerability can lead to unauthorized modification of application behavior, potential data integrity issues, and service disruption in production environments. This vulnerability is fixed in 2.0.0-beta.2.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Getgrav | Grav | < 2.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/getgrav/grav/security/advisories/GHSA-hmcx-ch82-3fv2ExploitVendor Advisory
- https://github.com/getgrav/grav/security/advisories/GHSA-hmcx-ch82-3fv2ExploitVendor Advisory
FAQ
What is CVE-2026-42608?
CVE-2026-42608 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 session_id (passed as __form-flash-id in POST...
How severe is CVE-2026-42608?
CVE-2026-42608 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-42608?
Check the references section above for vendor advisories and patch information. Affected products include: Getgrav Grav.