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Advisories

Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename

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severity
high
date
Affecting

  • grav >= 0, < 9.1.8

CWE
  • CWE-73 External Control of File Name or Path
CVSS
7.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
alienkeric
Description
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.

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