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EUVD-2026-278791

fkie_cve-2026-34750

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.

GHSA-frq9-7j6g-v74x — Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints

Affected: npm: @payloadcms/storage-azure, npm: @payloadcms/storage-gcs, npm: @payloadcms/storage-r2, npm: @payloadcms/storage-s3

### Impact

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.

Consumers are affected if ALL of these are true:

- Payload version **< v3.78.0** - Using client-upload signed-URL endpoints for any supported storage adapter

## Patches

This vulnerability has been patched in **v3.78.0**. Filename validation has been hardened for client uploads.

Consumers should upgrade to **v3.78.0** or later.

## Workarounds

Consumers can upgrade:

- Limit access to client-upload signed-URL endpoints to trusted users only.