Origin Validation Error Affecting payload package, versions >=3.0.0 <3.90.0>=4.0.0-canary.0 <4.0.0-canary.34
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PAYLOAD-20570534
- published8 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-105861 (opens in a new tab)How to fix?
Upgrade payload to version 3.90.0, 4.0.0-canary.34 or higher.
Overview
payload is a Node, React and MongoDB Headless CMS and Application Framework
Affected versions of this package are vulnerable to Origin Validation Error via getExternalFile in packages/payload/src/uploads/getExternalFile.ts, where the origin of an external file request URL is not validated before fetching. When a relative URL is supplied as the file source, the original code reconstructs the base URL using the attacker-controlled origin request header, allowing an attacker to redirect the server-side fetch to an arbitrary origin and potentially exfiltrate authentication cookies. Additionally, the externalFileHeaderFilter callback previously received a static copy of request headers without context about whether the target is same-origin, meaning auth cookies could be forwarded to external hosts.