CVE-2026-34750

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 6.5
EPSS 0.0034
EPSS Percentile 25.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-22
Status published
Products (5)
payloadcms/payload < 3.78.0 (2 CPE variants)
payloadcms/storage-azure 0 - 3.78.0npm
payloadcms/storage-gcs 0 - 3.78.0npm
payloadcms/storage-r2 0 - 3.78.0npm
payloadcms/storage-s3 0 - 3.78.0npm
Published Apr 01, 2026
Tracked Since Apr 02, 2026