CVE-2026-61873 · Symaro Security Advisory

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.

Severity (CVSS)

Base score	7.2
Severity	High
Version	CVSS 4.0
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
Provided by	CNA

Weaknesses

CWE-73 — External Control of File Name or Path

Affected products

Vendor	Product	Versions
getgrav	grav	0 to <9.1.8; 9.1.8

References

https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg (vendor-advisory)
https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-twig-processed-filename (third-party-advisory)

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 16 Jul 2026 07:01 UTC.