Authorization Bypass Through User-Controlled Key Affecting @payloadcms/storage-s3 package, versions <3.90.0>=4.0.0-canary.0 <4.0.0-canary.34
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Oct 2026
- disclosed6 Oct 2026
- creditYounghun Ko, German Jablonski
Introduced: 6 Oct 2026
NewCVE-2026-105867 (opens in a new tab)How to fix?
Upgrade @payloadcms/storage-s3 to version 3.90.0, 4.0.0-canary.34 or higher.
Overview
@payloadcms/storage-s3 is a Payload storage adapter for Amazon S3
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the S3 client-side direct upload flow in S3ClientUploadHandler.ts, where signed PUT URLs are generated without an If-None-Match: * precondition. An authenticated attacker can obtain a valid signed URL and use it to overwrite an existing S3 object, replacing another user's uploaded file without authorization.