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6.5
Payload: Internal Network Access via Malicious File Uploads
CVE-2026-27567
GHSA-hhfx-5x8j-f5f6
Summary
If you're using a version of Payload earlier than 3.75.0, an attacker with permission to upload files could potentially access your internal network. This is a security risk because it allows an attacker to see sensitive information. To fix this, update to version 3.75.0 or later, or limit who can upload files and who has access to those files.
What to do
- Update elliotpayload payload to version 3.75.0.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| elliotpayload | payload | <= 3.75.0 | 3.75.0 |
| payloadcms | payload | <= 3.75.0 | – |
Original title
Payload: Server-Side Request Forgery (SSRF) in External File URL Uploads
Original description
### Impact
A Server-Side Request Forgery (SSRF) vulnerability exists in Payload's external file upload functionality. When processing external URLs for file uploads, insufficient validation of HTTP redirects could allow an authenticated attacker to access internal network resources.
**Users are affected if ALL of these are true**:
- Payload version < v3.75.0
- At least one collection with `upload` enabled
- A user has `create` access to that upload-enabled collection
An authenticated user with upload collection write permissions could potentially access internal services. Response content from internal services could be retrieved through the application.
### Patches
This vulnerability has been patched in v3.75.0. Users should upgrade to v3.75.0 or later.
### Workarounds
If users cannot upgrade immediately, they can mitigate this vulnerability by disabling external file uploads via the `disableExternalFile` upload collection option, or by restricting `create` access on upload-enabled collections to **trusted users only**.
A Server-Side Request Forgery (SSRF) vulnerability exists in Payload's external file upload functionality. When processing external URLs for file uploads, insufficient validation of HTTP redirects could allow an authenticated attacker to access internal network resources.
**Users are affected if ALL of these are true**:
- Payload version < v3.75.0
- At least one collection with `upload` enabled
- A user has `create` access to that upload-enabled collection
An authenticated user with upload collection write permissions could potentially access internal services. Response content from internal services could be retrieved through the application.
### Patches
This vulnerability has been patched in v3.75.0. Users should upgrade to v3.75.0 or later.
### Workarounds
If users cannot upgrade immediately, they can mitigate this vulnerability by disabling external file uploads via the `disableExternalFile` upload collection option, or by restricting `create` access on upload-enabled collections to **trusted users only**.
nvd CVSS3.1
4.8
Vulnerability type
CWE-918
Server-Side Request Forgery (SSRF)
- https://nvd.nist.gov/vuln/detail/CVE-2026-27567
- https://github.com/advisories/GHSA-hhfx-5x8j-f5f6
- https://github.com/payloadcms/payload/commit/1041bb6 Patch
- https://github.com/payloadcms/payload/releases/tag/v3.75.0 Product Release Notes
- https://github.com/payloadcms/payload/security/advisories/GHSA-hhfx-5x8j-f5f6 Mitigation Vendor Advisory
Published: 24 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026