CVE-2026-105861

Payload external upload trust validation issue

Workarounds

It is recommended to update all Payload packages to >= 3.90.0 or >= 4.0.0-canary.34.

If you cannot, a valid workaround exists:

• Disable external URL-based upload retrieval where practical.
• If you cannot disable it, configure the upload header filter to remove authentication data from outbound file requests.
• Restrict access to the affected upload functionality.

Under certain external upload configurations, Payload could send authentication data to a destination that was not verified as trusted. If the affected request contained a valid session, this could expose that session to an unintended recipient.

You are affected if:

• You have enabled external URL-based upload retrieval, where authenticated requests can trigger it.

Kodem intelligence

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Payload now validates the destination before forwarding authentication data and reapplies that validation when a request changes destination.

Users should upgrade Payload packages to >= 3.90.0 or >= 4.0.0-canary.34.

1. What is CVE-2026-105861? CVE-2026-105861 is a high-severity security vulnerability in payload (npm), affecting versions >= 3.0.0, < 3.90.0. It is fixed in 3.90.0, 4.0.0-canary.34.
2. Which versions of payload are affected by CVE-2026-105861? payload (npm) versions >= 3.0.0, < 3.90.0 is affected.
3. Is there a fix for CVE-2026-105861? Yes. CVE-2026-105861 is fixed in 3.90.0, 4.0.0-canary.34. Upgrade to this version or later.
4. Is CVE-2026-105861 exploitable, and should I be worried? Whether CVE-2026-105861 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2026-105861 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2026-105861?
   • Upgrade payload to 3.90.0 or later
   • Upgrade payload to 4.0.0-canary.34 or later

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