Payload: Uploaded XML files could execute same-origin JavaScript

### Impact Under certain local upload configurations, an uploaded XML file and stylesheet could execute JavaScript in the Payload origin when a logged-in user opens the file. You are affected if: - You accept XML uploads (accepted by default). ### Patches Users should upgrade Payload packages to `>= 3.90.0` or `>= 4.0.0-canary.34`. ### Workarounds Disallow XML/XSL uploads. Source Code Location: https://github.com/payloadcms/payload Affected Packages: - npm:payload, affected < 3.90.0, patched in 3.90.0 - npm:payload, affected >= 4.0.0-canary.0, < 4.0.0-canary.34, patched in 4.0.0-canary.34 CWEs: - CWE-434: Unrestricted Upload of File with Dangerous Type CVSS: - CVSS_V4: score 8.6, CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N References: - https://github.com/payloadcms/payload/security/advisories/GHSA-9qpg-3cf8-w33x - https://nvd.nist.gov/vuln/detail/CVE-2026-105868 - https://github.com/payloadcms/payload/commit/a8c3a8e8e2680c96ec4f66f5b3854c5df6c35adf - https://github.com/payloadcms/payload/releases/tag/v3.90.0 - https://github.com/advisories/GHSA-9qpg-3cf8-w33x