CVE-2026-71403
MEDIUM6.1CVSS v3
—CVSS v2
0.20%
EPSS (exploit probability)
CWE-639CWE
Description
A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings.
This issue affects Rancher: before 2.15.1.
CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
Affected routers (0)
No routers currently mapped to this CVE in our database.