CVE-2026-61873

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Grav

PublishedJul 15, 2026

First seenJul 15, 2026

Weakness typeCWE-73CWE-73

How to fix

Update

getgrav grav9.1.8 or later

Vendor advisories

github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg

Affected products

Product	Affected versions	Fixed in
getgrav grav	v < 9.1.8	9.1.8

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