---
id: GHSA-fwwx-3362-3947
title: >-
  Duplicate Advisory: Grav: Blueprint dynamic-data bare-function branch is
  denylist-gated and omits error_log, giving arbitrary file write
summary: >-
  Duplicate Advisory: Grav: Blueprint dynamic-data bare-function branch is
  denylist-gated and omits error_log, giving arbitrary file write
severity: critical
cvss: 8.8
cwe:
  - CWE-94
vendor: getgrav
product: getgrav/grav
ecosystem: composer
affected:
  - getgrav/grav < 2.0.15
published: '2026-08-18'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:56:28Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-fwwx-3362-3947'
references:
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75827'
  - url: >-
      https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-error-log
  - url: 'https://github.com/advisories/GHSA-fwwx-3362-3947'
tags:
  - ghsa
  - composer
ingestedAt: '2026-09-17T21:29:16.994Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-f8wv-xp27-6gq7. This link is maintained to preserve external references.

### Original Description
Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive to append PHP payloads to web-accessible files, achieving remote code execution.

## Affected packages

- `getgrav/grav < 2.0.15`

## Remediation

Refer to the advisory for the patched release.