CVE-2026-34750
Medium
Description
Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3, the client-upload signed-URL endpoints for S3, GCS, Azure, and R2 did not properly sanitize filenames. An attacker could craft filenames to escape the intended storage location. This issue has been patched in version 3.78.0 for @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3.
SeverityMedium
CVSS6.5
Exploit probability29. percentile0.4%
ProductPayload
PublishedApr 1, 2026
First seenApr 1, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- payloadcms payload3.78.0 or later
- @payloadcms/storage-azure3.78.0 or later
- @payloadcms/storage-gcs3.78.0 or later
- @payloadcms/storage-r23.78.0 or later
- @payloadcms/storage-s33.78.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| payloadcms payload | v < 3.78.0 | 3.78.0 |
| @payloadcms/storage-azurenpm | v < 3.78.0 | 3.78.0 |
| @payloadcms/storage-gcsnpm | v < 3.78.0 | 3.78.0 |
| @payloadcms/storage-r2npm | v < 3.78.0 | 3.78.0 |
| @payloadcms/storage-s3npm | v < 3.78.0 | 3.78.0 |
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