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Server-Side Request Forgery (SSRF) in External File URL Uploads

Moderate
denolfe published GHSA-hhfx-5x8j-f5f6 Feb 23, 2026

Package

npm payload (npm)

Affected versions

< 3.75.0

Patched versions

3.75.0

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.

You 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 you cannot upgrade immediately, you 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.

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

CVE ID

CVE-2026-27567

Weaknesses

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Learn more on MITRE.

Credits