Payload external upload trust validation issue

## Impact 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. ## Patches 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`. ## 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.

Source published

7 Oct 2026 20:29:41 UTC

Source modified

7 Oct 2026 20:45:05 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Publisher rating · HIGH