CVE-2026-27567: Payload has Server-Side Request Forgery (SSRF) in External File URL Uploads
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.
Other sources
Payload is a free and open source headless content management system. Prior to 3.75.0, 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. The Payload environment must have at least one collection with upload enabled and a user who has create access to that upload-enabled collection in order to be vulnerable. An authenticated user with upload collection write permissions could potentially access internal services. Response content from internal services could be retrieved through the application. This vulnerability has been patched in v3.75.0. As a workaround, one may 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.
— MITRE
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2026-27567?
CVE-2026-27567 is classified as a critical severity vulnerability due to its potential for exploitation via Server-Side Request Forgery.
How do I fix CVE-2026-27567?
To mitigate CVE-2026-27567, upgrade Payload to version 3.75.0 or later, which addresses the SSRF vulnerability.
What versions of Payload are affected by CVE-2026-27567?
CVE-2026-27567 affects all versions of Payload prior to 3.75.0.
What type of vulnerability is CVE-2026-27567?
CVE-2026-27567 is a Server-Side Request Forgery (SSRF) vulnerability.
Can CVE-2026-27567 lead to data compromise?
Yes, CVE-2026-27567 can potentially allow an attacker to access internal resources, leading to data compromise.