CVE-2026-34750

Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints

State: Published
Severity: 6.5 Medium
Published: Apr 1, 2026
Updated: Apr 2, 2026
Reserved: Mar 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
payloadpayloadcms	< 3.78.0Affected

References

https://github.com/payloadcms/payload/security/advisories/GHSA-frq9-7j6g-v74x

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