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DRUPAL-CONTRIB-2026-337

Published Nov 11, 2026·Last modified Nov 11, 2026
Affected Components(1)
Packagist:https://packages.drupal.org/8drupal/s3fs_cors
< 1.4.0
Description

The S3 File System CORS Upload module lets users upload files straight from the browser to Amazon S3 (or an S3-compatible service), using a file widget on entity forms.

The module doesn't sufficiently restrict the upload permission it gives the browser. A user who can upload through the widget can overwrite other files already stored in the bucket, including files they couldn't otherwise replace.

This vulnerability is mitigated by the fact that an attacker must have access to a form that uses the S3 File System CORS Upload widget.

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Risk Scores
Base Score
-1.0

Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.

Threat Intelligence
-1.0

No exploitation activity has been observed at this time. Continue routine monitoring.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-126746
    Alias
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