要点
- CVE-2026-105867 は payload (payloadcms), @payloadcms/storage-s3 に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.22%（全脆弱性の 12.6% より高い）。
- 対処：3.90.0, 4.0.0-canary.34 以降に更新してください。
概要
Impact
An authenticated user could overwrite an existing S3 object belonging to another upload collection, bypassing that collection’s access controls and prior file validation.
You are affected if ALL of these are true:
- Client uploads are enabled for multiple collections that share an S3 bucket.
- useCompositePrefixes is not configured or is set to
false.
Patches
Users should upgrade Payload packages to >= 3.90.0 or >= 4.0.0-canary.34.
Workarounds
Disable client uploads until you can upgrade.
NVD の説明
Payload is a free and open source headless content management system. In @payloadcms/storage-s3 versions before 3.90.0 and canary versions before 4.0.0-canary.34, an authenticated user can overwrite an existing S3 object belonging to another upload collection when client uploads are enabled for multiple collections sharing a bucket and useCompositePrefixes is false or unset. This bypasses the target collection's access controls and prior file validation. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
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