PT-2026-130601
CVE-2026-118574
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Published
2026-10-28
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Updated
2026-10-28
Description by
Score
N/A
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S3 File System (s3fs) provides an additional file system to your Drupal site that stores files in Amazon's Simple Storage Service (S3) storage.
The module doesn't sufficiently isolate upload context between separate object(file) operations in the same request resulting in the potential for objects to be uploaded with incorrect access control list (ACL) entries or corruption through incorrect operation metadata.
This vulnerability is mitigated by the fact that an attacker must be able to trigger multiple file operations on S3FS.
Some vectors are mitigated by:
- Not enabling private:// takeover (
$settings['s3fs.use s3 for private'] = FALSE;) or only enabled with$settings['s3fs.upload as private'] = TRUE; - The deployment does not utilize
hook s3fs stream open params alter(),hook s3fs upload params alter(),hook s3fs copy params alter(), orhook s3fs command params alter()
If both points above have always been true, all currently known vectors are mitigated.
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