CVE-2026-61873 — Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename
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 proc…
Published: 2026-07-15 · CVSS: 7.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7