What’s Vulnerable › Vulnerabilities
CVE-2026-34750: Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-01 · updated 2026-10-25
- Weakness: CWE-22
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.
Affected products
- payloadcms payload: before 3.78.0 — fixed in 3.78.0
How to fix
Upgrade to a fixed version: payloadcms payload 3.78.0. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-34750 or the next vulnerability affects your stack