CVE-2026-61873: Getgrav Grav

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin's process.save.filename parameter, which is validated against path traversal before Twig processing but never re-validated after rendering. Attackers can submit form data containing path traversal sequences that are processed through Twig templates, allowing them to write arbitrary files including PHP webshells to the web root or other sensitive directories.

Affected products

• Getgrav Grav: before 9.1.8 (fixed in 9.1.8)

Published 2026-07-15. Last modified 2026-07-15.