CVE-2017-6921 File REST resource does not properly validate

What is CVE-2017-6921?

CVE-2017-6921 is a medium-severity missing authorization vulnerability in Drupal Drupal, published on 15 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Drupal 8 prior to 8.3.4; The file REST resource does not properly validate some fields when manipulating files. A site is only affected by this if the site has the RESTful Web Services (rest) module enabled, the file REST resource is enabled and allows PATCH requests, and an attacker can get or register a user account on the site with permissions to upload files and to modify the file resource.

Weakness: CWE-20

Which versions are affected by CVE-2017-6921?

4 open source packages ship an affected version, including drupal/core and drupal/drupal. It affects 1 product.

Products include Drupal Drupal.

How do I fix CVE-2017-6921?

Upgrade drupal/core to 8.3.4 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2017-6921 being exploited?

There is no known exploitation of CVE-2017-6921 in the wild and no public exploit code.

Other vulnerabilities in Drupal Drupal

• CVE-2026-9082 Drupal Core SQL Injection Exploited Critical 9.8
• CVE-2020-13671 Drupal core Un-restricted Upload of File Exploited High 8.8
• CVE-2019-6340 Drupal Core Remote Code Execution Exploited High 8.1
• CVE-2009-3352 Other in n/a Critical 10.0
• CVE-2024-55636 Drupal core - Less critical - Gadget chain - SA-CORE-2024-006 Critical 9.8

All Drupal Drupal vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-h377-287m-w2r9.