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Fencer Intel
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CVE-2026-126746 json

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…

published 16h ago modified 16h ago also DRUPAL-CONTRIB-2026-337

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
—
no EPSS score yet
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist drupal/s3fs_cors 1.4.0

Is CVE-2026-126746 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Affected packages

ecosystem package affected fixed in
packagist drupal/s3fs_cors
<1.4.0
1.4.0

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.