When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.
CVE-2026-87861
CVSS base score
9.1 (v3.1)
Severity
CRITICAL
Attack vector
Network
Weakness
CWE-201
Last modified
October 30, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N