VULNERABILITY INTELLIGENCE

CVE-2026-71403

CVSS score6.1 MEDIUM
EPSS probability0.37%
CISA KEVNot currently listed
Published2026-09-03
Last modified2026-09-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

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.

Weakness classification

  • meissner@suse.de: CWE-639

Primary references